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**999** (**nine hundred ninety-nine** or **nine-nine-nine**) is a natural number following 998 and preceding 1000.

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Cardinal | Nine hundred [and] ninety-nine | |||

Ordinal | 999th (Nine hundred [and] ninety-ninth) | |||

Factorization | 3^{3}× 37 | |||

Divisors | 1, 3, 9, 27, 37, 111, 333, 999 | |||

Greek numeral | ϠϞΘ´ | |||

Roman numeral | CMXCIX | |||

Binary | 1111100111_{2} | |||

Ternary | 1101000_{3} | |||

Quaternary | 33213_{4} | |||

Quinary | 12444_{5} | |||

Senary | 4343_{6} | |||

Octal | 1747_{8} | |||

Duodecimal | 6B3_{12} | |||

Hexadecimal | 3E7_{16} | |||

Vigesimal | 29J_{20} | |||

Base 36 | RR_{36} |

## In mathematics

- a Harshad number.
- a Kaprekar number.
^{[1]} - a repdigit in bases 10 and 36.
- a palindromic number in bases 10, 14 (515
_{14}), and 36 (RR_{36}). - the largest 3-digit decimal integer.

## Symbology and numerology

In SubGenius numerology the number 999 represents Bob Dobbs.

## Emergency Number

**999** is the number used to contact the Emergency Services in many countries; See 999 (emergency telephone number).

## References

**^**"Sloane's A006886 : Kaprekar numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-02.

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