250 (number)

250 is a natural number that follows 249 and precedes 251. It is an even number, and can be written in decimal notation with three digits: 2, 5, and 0.

Because it is one quarter of 1000 (a quarter being 250, or a quarter of 1000), 250 appears regularly in measurements, currency, and general divisions of the decimal system.

Mathematical properties

The prime factorization of 250 is 2 × 5 × 5 × 5, which can also be written as 2 × 5³. Its divisors are 1, 2, 5, 10, 25, 50, 125, and 250. The sum of its proper divisors is 218, which is less than 250; therefore 250 is a deficient number.

250 is not a perfect square, since 15² = 225 and 16² = 256. It is 2 multiplied by 125, and can therefore be written as 2 × 5³, which means it is divisible by 5, 10, and 25 without remainder.

General use

250 appears among standard values for currency notes and measurement units. It is also used for estimation and rounding when a middle value between 200 and 300 is desired. In music and some industries, 250 is for example among standard values for power or capacity.

Other notations

In Roman numerals, 250 is written as CCL (C = 100, L = 50). In binary notation it is 11111010, and in hexadecimal it is FA.