256591492 has 24 divisors (see below), whose sum is σ = 462280896. Its totient is φ = 124547808.

The previous prime is 256591487. The next prime is 256591513. The reversal of 256591492 is 294195652.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24258 + ... + 33190.

It is an arithmetic number, because the mean of its divisors is an integer number (19261704).

Almost surely, 2^256591492 is an apocalyptic number.

It is an amenable number.

256591492 is a deficient number, since it is larger than the sum of its proper divisors (205689404).

256591492 is a wasteful number, since it uses less digits than its factorization.

256591492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9147 (or 9145 counting only the distinct ones).

The product of its digits is 194400, while the sum is 43.

The square root of 256591492 is about 16018.4734603520. The cubic root of 256591492 is about 635.4490732917.

The spelling of 256591492 in words is "two hundred fifty-six million, five hundred ninety-one thousand, four hundred ninety-two".