255693 has 8 divisors (see below), whose sum is σ = 352800. Its totient is φ = 164528.

The previous prime is 255679. The next prime is 255709. The reversal of 255693 is 396552.

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

It is a cyclic number.

It is not a de Polignac number, because 255693 - 2⁹ = 255181 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 255693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1383 + ... + 1556.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2²⁵⁵⁶⁹³ is an apocalyptic number.

It is an amenable number.

255693 is a deficient number, since it is larger than the sum of its proper divisors (97107).

255693 is a wasteful number, since it uses less digits than its factorization.

255693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971.

The product of its digits is 8100, while the sum is 30.

The square root of 255693 is about 505.6609536043. The cubic root of 255693 is about 63.4706500444.

It can be divided in two parts, 255 and 693, that multiplied together give a triangular number (176715 = T₅₉₄).

The spelling of 255693 in words is "two hundred fifty-five thousand, six hundred ninety-three".