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999 |
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| Cardinal | Nine hundred [and] ninety-nine |
| Ordinal | 999th (Nine hundred [and] ninety-ninth) |
| Factorization | ![]() |
| Divisors | 1, 3, 9, 27, 37, 111, 333, 999 |
| Roman numeral | CMXCIX |
| Binary | 11111001112 |
| Octal | 17478 |
| Duodecimal | 6B312 |
| Hexadecimal | 3E716 |
Nine hundred and ninety-nine is the natural number following nine hundred ninety-eight and preceding one thousand. 999 is a Harshad number, a Kaprekar number, a repdigit in bases 10 and 36, and a palindromic number in bases 10, 14, and 36. It is the largest 3 digit whole number in base 10.
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