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| Cardinal | Nine hundred [and] ninety-nine | |||
| Ordinal | 999th (Nine hundred [and] ninety-ninth) |
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| Factorization | 33× 37 | |||
| Divisors | 1, 3, 9, 27, 37, 111, 333, 999 | |||
| Roman numeral | CMXCIX | |||
| Binary | 11111001112 | |||
| Ternary | 11010003 | |||
| Quaternary | 332134 | |||
| Quinary | 124445 | |||
| Senary | 43436 | |||
| Octal | 17478 | |||
| Duodecimal | 6B312 | |||
| Hexadecimal | 3E716 | |||
| Vigesimal | 29J20 | |||
| Base 36 | RR36 | |||
999 (nine hundred ninety-nine) is a natural number following 998 and preceding 1000.
In SubGenius numerology the number 999 represents Bob Dobbs.
999 is the number used to contact the Emergency Services in many countries; See 999 (emergency telephone number).