255605 has 16 divisors (see below), whose sum is σ = 359040. Its totient is φ = 171072.

The previous prime is 255589. The next prime is 255613. The reversal of 255605 is 506552.

255605 is nontrivially palindromic in base 15.

It is a cyclic number.

It is not a de Polignac number, because 255605 - 2⁴ = 255589 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2291 + ... + 2399.

It is an arithmetic number, because the mean of its divisors is an integer number (22440).

2²⁵⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

255605 is a deficient number, since it is larger than the sum of its proper divisors (103435).

255605 is a wasteful number, since it uses less digits than its factorization.

255605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 255605 is about 505.5739312900. The cubic root of 255605 is about 63.4633677983.

The spelling of 255605 in words is "two hundred fifty-five thousand, six hundred five".