255686 has 4 divisors (see below), whose sum is σ = 383532. Its totient is φ = 127842.

The previous prime is 255679. The next prime is 255709. The reversal of 255686 is 686552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

255686 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63920 + ... + 63923.

It is an arithmetic number, because the mean of its divisors is an integer number (95883).

2²⁵⁵⁶⁸⁶ is an apocalyptic number.

255686 is a deficient number, since it is larger than the sum of its proper divisors (127846).

255686 is a wasteful number, since it uses less digits than its factorization.

255686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127845.

The product of its digits is 14400, while the sum is 32.

The square root of 255686 is about 505.6540319230. The cubic root of 255686 is about 63.4700708360.

The spelling of 255686 in words is "two hundred fifty-five thousand, six hundred eighty-six".