Nine hundred is the natural number following eight hundred ninety-nine and preceding nine hundred one. It is the square of 30 and a Harshad number.

Ordinal	Nine hundred
Cardinal	900th
Factorization	$2^2\; \backslash cdot\; 3^2\; \backslash cdot\; 5^2$
Roman numeral	CM
Binary	1110000100
Hexadecimal	384

Nine hundred is also:

• The telephone area code for "premium" phone calls in the North American Numbering Plan: see 900 number.
• In Greek number symbols Sampi ("Great Pi" ostensibly from the visual resemblance to the greek letter), which is signified by a convex horisontal arc with two parallel vertical lines below. Sometimes represented in a slightly tilted form.
• For the year AD, see 900.

---- 901 = 17 × 53 ---- 902 = 2 × 11 × 41, sphenic number, nontotient, Harshad number, also the telephone area code for Nova Scotia and Prince Edward Island ---- 903 = 3 × 7 × 43, sphenic number, triangular number, Mertens function(903) returns 0 ---- 904 = 2³ × 113 or 113x8, Mertens function(904) returns 0 ---- 905 = 5 × 181, sum of seven consecutive primes (109 + 113 + 127 + 131 + 137 + 139 + 149) ---- 906 = 2 × 3 × 151, sphenic number, Mertens function(906) returns 0 ---- 907 prime number, also the telephone area code for Alaska ---- 908 = 2² × 227, nontotient ---- 909 = 3² × 101 ---- 910 = 2 × 5 × 7 × 13, Mertens function(910) returns 0, Harshad number ---- 911 has its own page ---- 912 = 2⁴ × 3 × 19, sum of four consecutive primes (223 + 227 + 229 + 233), sum of ten consecutive primes (67 + 73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109), Harshad number ---- 913 = 11 × 83, Smith number, Mertens function(913) returns 0 ---- 914 = 2 × 457, nontotient ---- 915 = 3 × 5 × 61, sphenic number, Smith number, Mertens function(915) returns 0, Harshad number ---- 916 = 2² × 229, Mertens function(916) returns 0, nontotient ---- 917 = 7 × 131, sum of five consecutive primes (173 + 179 + 181 + 191 + 193) ---- 918 = 2 × 3³ × 17, Harshad number ---- 919 prime number, cuban prime, palindromic prime, centered hexagonal number, Mertens function(919) returns 0 ---- 920 = 2³ × 5 × 23, Mertens function(920) returns 0 ---- 921 = 3 × 307 ---- 922 = 2 × 461, nontotient, Smith number ---- 923 = 13 × 71 ---- 924 = 2² × 3 × 7 × 11, sum of a twin prime (461 + 463) ---- 925 = 5² × 37, centered square number ---- 926 = 2 × 463, sum of six consecutive primes (139 + 149 + 151 + 157 + 163 + 167), nontotient ---- 927 = 3² × 103, tribonacci number ---- 928 = 2⁵ × 29, sum of four consecutive primes (227 + 229 + 233 + 239), sum of eight consecutive primes (101 + 103 + 107 + 109 + 113 + 127 + 131 + 137) ---- 929 prime number, palindromic prime, sum of nine consecutive primes (83 + 89 + 97 + 101 + 103 + 107 + 109 + 113 + 127) ---- 930 = 2 × 3 × 5 × 31, pronic number ---- 931 = 7² × 19, sum of three consecutive primes (307 + 311 + 313) ---- 932 = 2² × 233 ---- 933 = 3 × 311 ---- 934 = 2 × 467, nontotient ---- 935 = 5 × 11 × 17, sphenic number, Harshad number ---- 936 = 2³ × 3² × 13, pentagonal pyramidal number, Harshad number ---- 937 prime number, star number ---- 938 = 2 × 7 × 67, sphenic number, nontotient ---- 939 = 3 × 313 ---- 940 = 2² × 5 × 47 ---- 941 prime number, sum of three consecutive primes (311 + 313 + 317), sum of five consecutive primes (179 + 181 + 191 + 193 + 197) ---- 942 = 2 × 3 × 157, sphenic number, sum of four consecutive primes (229 + 233 + 239 + 241), nontotient ---- 943 = 23 × 41 ---- 944 = 2⁴ × 59, nontotient ---- 945 = 3³ × 5 × 7, double factorial of 9, smallest odd abundant number (divisors less than itself add up to 975) ---- 946 = 2 × 11 × 43, sphenic number, triangular number, hexagonal number ---- 947 prime number, sum of seven consecutive primes (113 + 127 + 131 + 137 + 139 + 149 + 151) ---- 948 = 2² × 3 × 79, nontotient ---- 949 = 13 × 73 ---- 950 = 2 × 5² × 19, nontotient, also one of two ISBN Group Identifiers for books published in Argentina ---- 951 = 3 × 317, centered pentagonal number, also one of two ISBN Group Identifiers for books published in Finland ---- 952 = 2³ × 7 × 17

• 952 is also 9-5-2, a card game similar to bridge.
• one of two ISBN Group Identifiers for books published in Finland

---- 953 prime number, Sophie Germain prime, centered heptagonal number, also ISBN Group Identifier for books published in Croatia ---- 954 = 2 × 3² × 53, sum of ten consecutive primes (73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113), nontotient, Harshad number, also ISBN Group Identifier for books published in Bulgaria ---- 955 = 5 × 191, also ISBN Group Identifier for books published in Sri Lanka ---- 956 = 2² × 239, also ISBN Group Identifier for books published in Chile ---- 957 = 3 × 11 × 29, sphenic number, also one of two ISBN Group Identifiers for books published in Taiwan and China ---- 958 = 2 × 479, nontotient, Smith number, also ISBN Group Identifier for books published in Colombia ---- 959 = 7 × 137, also ISBN Group Identifier for books published in Cuba ---- 960 = 2⁶ × 3 × 5, sum of six consecutive primes (149 + 151 + 157 + 163 + 167 + 173), Harshad number, also ISBN Group Identifier for books published in Greece ---- 961 = 31², sum of three consecutive primes (313 + 317 + 331), sum of five consecutive primes (181 + 191 + 193 + 197 + 199), centered octagonal number, also ISBN Group Identifier for books published in Slovenia ---- 962 = 2 × 13 × 37, sphenic number, nontotient, also one of two ISBN Group Identifiers for books published in Hong Kong ---- 963 = 3² × 107, sum of the first twenty-four primes, also ISBN Group Identifier for books published in Hungry ---- 964 = 2² × 241, sum of four consecutive primes (233 + 239 + 241 + 251), nontotient, also ISBN Group Identifier for books published in Iran ---- 965 = 5 × 193, also ISBN Group Identifier for books published in Israel ---- 966 = 2 × 3 × 7 × 23, sum of eight consecutive primes (103 + 107 + 109 + 113 + 127 + 131 + 137 + 139), Harshad number, also one of two ISBN Group Identifiers for books published in Ukraine ---- 967 prime number, also one of two ISBN Group Identifiers for books published in Malaysia ---- 968 = 2³ × 11², nontotient, also one of two ISBN Group Identifiers for books published in Mexico ---- 969 = 3 × 17 × 19, sphenic number, nonagonal number, tetrahedral number, also ISBN Group Identifier for books published in Pakistan ---- 970 = 2 × 5 × 97, sphenic number, also one of two ISBN Group Identifiers for books published in Mexico ---- 971 prime number, also ISBN Group Identifier for books published in the Philippines ---- 972 = 2² × 3⁵, Harshad number, also one of two ISBN Group Identifiers for books published in Portugal ---- 973 = 7 × 139, also ISBN Group Identifier for books published in Romania ---- 974 = 2 × 487, nontotient, also ISBN Group Identifier for books published in Thailand ---- 975 = 3 × 5² × 13, also ISBN Group Identifier for books published in Turkey ---- 976 = 2⁴ × 61, decagonal number, also ISBN Group Identifier for books published in Antigua, Bahamas, Barbados, Belize, Cayman Islands, Dominica, Grenada, Guyana, Jamaica, Montserrat, St. Kitts-Nevis, St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, and the British Virgin Islands ---- 977 prime number, sum of nine consecutive primes (89 + 97 + 101 + 103 + 107 + 109 + 113 + 127 + 131), also ISBN Group Identifier for books published in Egypt ---- 978 = 2 × 3 × 163, sphenic number, nontotient, also ISBN Group Identifier for books published in Nigeria ---- 979 = 11 × 89, also ISBN Group Identifier for books published in Indonesia ---- 980 = 2² × 5 × 7², also ISBN Group Identifier for books published in Venezuela ---- 981 = 3² × 109, also one of two ISBN Group Identifiers for books published in Singapore ---- 982 = 2 × 491, also ISBN Group Identifier for books published in the Cook Islands, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Caledonia, Niue, Palau, Solomon Islands, Tokelau, Tonga, Tuvalu, Vanuatu, Western Samoa ---- 983 prime number, safe prime, Wedderburn-Etherington number, also one of two ISBN Group Identifiers for books published in Malaysia ---- 984 = 2³ × 3 × 41, also ISBN Group Identifier for books published in Bangladesh ---- 985 = 5 × 197, sum of three consecutive primes (317 + 331 + 337), Smith number, also one of two ISBN Group Identifiers for books published in Belarus ---- 986 = 2 × 17 × 29, sphenic number, nontotient, also one of two ISBN Group Identifiers for books published in Taiwan and China ---- 987 = 3 × 7 × 47, also one of two ISBN Group Identifiers for books published in Argentina ---- 988 = 2² × 13 × 19, sum of four consecutive primes (239 + 241 + 251 + 257), nontotient, also one of two ISBN Group Identifiers for books published in Hong Kong ---- 989 = 23 × 43, also one of two ISBN Group Identifiers for books published in Portugal ---- 990 = 2 × 3² × 5 × 11, sum of six consecutive primes (151 + 157 + 163 + 167 + 173 + 179), triangular number, Harshad number ---- 991 prime number, sum of five consecutive primes (191 + 193 + 197 + 199 + 211), sum of seven consecutive primes (127 + 131 + 137 + 139 + 149 + 151 + 157) ---- 992 = 2⁵ × 31, pronic number, nontotient ---- 993 = 3 × 331 ---- 994 = 2 × 7 × 71, sphenic number, nontotient ---- 995 = 5 × 199 ---- 996 = 2² × 3 × 83 ---- 997 prime number ---- 998 = 2 × 499, nontotient ---- 999 = 3³ × 37, Kaprekar number, Harshad number

• In some parts of the world, such as the UK and Commonwealth countries, 999 (pronounced as 9-9-9) is the emergency telephone number; it is as of 2004 being quickly supplemented, by the international emergency number 112 and the North American 911 (number).
• 999 was also the name of a significant London punk band active during the 1970s.

---- See also: 1000 (number) This article is licensed under the GNU Free Documentation License.