255406 has 4 divisors (see below), whose sum is σ = 383112. Its totient is φ = 127702.

The previous prime is 255383. The next prime is 255413. The reversal of 255406 is 604552.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63850 + ... + 63853.

It is an arithmetic number, because the mean of its divisors is an integer number (95778).

2²⁵⁵⁴⁰⁶ is an apocalyptic number.

255406 is a deficient number, since it is larger than the sum of its proper divisors (127706).

255406 is a wasteful number, since it uses less digits than its factorization.

255406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127705.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 255406 is about 505.3770869361. The cubic root of 255406 is about 63.4468938260.

Adding to 255406 its reverse (604552), we get a palindrome (859958).

The spelling of 255406 in words is "two hundred fifty-five thousand, four hundred six".