256492390 has 32 divisors (see below), whose sum is σ = 575610624. Its totient is φ = 79945440.

The previous prime is 256492363. The next prime is 256492403. The reversal of 256492390 is 93294652.

It is a super-2 number, since 2×256492390² = 131576692255824200, which contains 22 as substring.

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, 165784 + ... + 167323.

It is an arithmetic number, because the mean of its divisors is an integer number (17987832).

Almost surely, 2^256492390 is an apocalyptic number.

256492390 is an abundant number, since it is smaller than the sum of its proper divisors (319118234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256492390 is a wasteful number, since it uses less digits than its factorization.

256492390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333132.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 256492390 is about 16015.3797956839. The cubic root of 256492390 is about 635.3672540249.

The spelling of 256492390 in words is "two hundred fifty-six million, four hundred ninety-two thousand, three hundred ninety".