255405 has 8 divisors (see below), whose sum is σ = 408672. Its totient is φ = 136208.

The previous prime is 255383. The next prime is 255413. The reversal of 255405 is 504552.

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 255405 - 2⁸ = 255149 is a prime.

255405 is a modest number, since divided by 405 gives 255 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8499 + ... + 8528.

It is an arithmetic number, because the mean of its divisors is an integer number (51084).

2²⁵⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

255405 is a deficient number, since it is larger than the sum of its proper divisors (153267).

255405 is a wasteful number, since it uses less digits than its factorization.

255405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17035.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 255405 is about 505.3760975749. The cubic root of 255405 is about 63.4468110206.

Adding to 255405 its reverse (504552), we get a palindrome (759957).

The spelling of 255405 in words is "two hundred fifty-five thousand, four hundred five".