256974539 has 4 divisors (see below), whose sum is σ = 265835760. Its totient is φ = 248113320.

The previous prime is 256974503. The next prime is 256974577. The reversal of 256974539 is 935479652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256974539 - 2²⁰ = 255925963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256974589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4430567 + ... + 4430624.

It is an arithmetic number, because the mean of its divisors is an integer number (66458940).

Almost surely, 2^256974539 is an apocalyptic number.

256974539 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

256974539 is a deficient number, since it is larger than the sum of its proper divisors (8861221).

256974539 is an equidigital number, since it uses as much as digits as its factorization.

256974539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861220.

The product of its digits is 2041200, while the sum is 50.

The square root of 256974539 is about 16030.4254154405. The cubic root of 256974539 is about 635.7651214949.

The spelling of 256974539 in words is "two hundred fifty-six million, nine hundred seventy-four thousand, five hundred thirty-nine".