999 (number)

This article is about the natural number. For the emergency telephone number, see 999 (emergency telephone number). For other uses, see 999 (disambiguation).

999 (nine hundred [and] ninety-nine or nine-nine-nine) is a natural number following 998 and preceding 1000. It is the largest 3-digit decimal integer.

← 998 999 1000 →
List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	Nine hundred [and] ninety-nine
Ordinal	999th (Nine hundred [and] ninety-ninth)
Factorization	33 × 37
Divisors	1, 3, 9, 27, 37, 111, 333, 999
Greek numeral	ϠϞΘ´
Roman numeral	CMXCIX
Binary	11111001112
Ternary	11010003
Senary	43436
Octal	17478
Duodecimal	6B312
Hexadecimal	3E716

In mathematics

• $999=3^{3}\times 37$, a Kaprekar number.
• a repdigit in decimal and hexatridecimal.
• a palindromic number in bases 10, 14 (515₁₄), and 36 (RR₃₆)..
• the largest number in English not containing the letter 'o' in its name, when using short scale.
• A base-10 Harshad number because ${\frac {999}{(9+9+9)}}=37$, a whole number

Other fields

• In some parts of the world, such as the UK and Commonwealth countries, 999 (pronounced as 9-9-9) is the emergency telephone number.
• 999 was a London punk band active during the 1970s.
• 999 is also the short name for the visual novel Nine Hours, Nine Persons, Nine Doors.
• 999 is the last 3 digit number. It is also the last number in English written without a comma, as numbers above 999 must require a comma (e.g. numbers starting from 1,000 or more).