256582403 has 32 divisors (see below), whose sum is σ = 340032000. Its totient is φ = 187557120.

The previous prime is 256582399. The next prime is 256582423. The reversal of 256582403 is 304285652.

It is a cyclic number.

It is not a de Polignac number, because 256582403 - 2² = 256582399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256582423) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 158663 + ... + 160271.

It is an arithmetic number, because the mean of its divisors is an integer number (10626000).

Almost surely, 2^256582403 is an apocalyptic number.

256582403 is a deficient number, since it is larger than the sum of its proper divisors (83449597).

256582403 is a wasteful number, since it uses less digits than its factorization.

256582403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1755.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 256582403 is about 16018.1897541514. The cubic root of 256582403 is about 635.4415702307.

The spelling of 256582403 in words is "two hundred fifty-six million, five hundred eighty-two thousand, four hundred three".