999 (number) explained

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

Number:	999
Cardinal:	Nine hundred [and] ninety-nine
Ordinal Text:	Nine hundred [and] ninety-ninth
Divisor:	1, 3, 9, 27, 37, 111, 333, 999

In mathematics

999=3 ^{3} x 37 , a Kaprekar number.^[1]

• a repdigit in decimal and hexatridecimal.
• a palindromic number in bases 10, 14 (515₁₄), and 36 (RR₃₆).
• the largest 3-digit decimal integer.
• the largest number in English not containing the letter 'o' in its name, when using short scale.
• A base-10 Harshad number because

(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.

Notes and References

1. Web site: Sloane's A006886 : Kaprekar numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-06-02.