999 (number)
Encyclopedia
Nine hundred and ninety-nine is the natural number
following nine hundred ninety-eight and preceding one thousand. 999 is a Harshad number
and a Kaprekar number
. It is the largest 3 digit whole number in base 10.
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...
following nine hundred ninety-eight and preceding one thousand. 999 is a Harshad number
Harshad number
A Harshad number, or Niven number in a given number base, is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers were defined by D. R. Kaprekar, a mathematician from India. The word "Harshad" comes from the Sanskrit + , meaning joy-giver. The Niven...
and a Kaprekar number
Kaprekar number
In mathematics, a Kaprekar number for a given base is a non-negative integer, the representation of whose square in that base can be split into two parts that add up to the original number again. For instance, 45 is a Kaprekar number, because 45² = 2025 and 20+25 = 45. The Kaprekar numbers are...
. It is the largest 3 digit whole number in base 10.