255986 has 8 divisors (see below), whose sum is σ = 406620. Its totient is φ = 120448.

The previous prime is 255977. The next prime is 255989. The reversal of 255986 is 689552.

It can be written as a sum of positive squares in 2 ways, for example, as 255025 + 961 = 505^2 + 31^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (255989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3731 + ... + 3798.

2²⁵⁵⁹⁸⁶ is an apocalyptic number.

255986 is a deficient number, since it is larger than the sum of its proper divisors (150634).

255986 is a wasteful number, since it uses less digits than its factorization.

255986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548.

The product of its digits is 21600, while the sum is 35.

The square root of 255986 is about 505.9505904730. The cubic root of 255986 is about 63.4948845777.

The spelling of 255986 in words is "two hundred fifty-five thousand, nine hundred eighty-six".