256749339 has 32 divisors (see below), whose sum is σ = 437230080. Its totient is φ = 130118400.

The previous prime is 256749329. The next prime is 256749349. The reversal of 256749339 is 933947652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256749329) and next prime (256749349).

It is not a de Polignac number, because 256749339 - 2⁴ = 256749323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256749329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4084 + ... + 23025.

It is an arithmetic number, because the mean of its divisors is an integer number (13663440).

Almost surely, 2^256749339 is an apocalyptic number.

256749339 is a deficient number, since it is larger than the sum of its proper divisors (180480741).

256749339 is a wasteful number, since it uses less digits than its factorization.

256749339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27171.

The product of its digits is 1224720, while the sum is 48.

The square root of 256749339 is about 16023.3997328906. The cubic root of 256749339 is about 635.5793493299.

The spelling of 256749339 in words is "two hundred fifty-six million, seven hundred forty-nine thousand, three hundred thirty-nine".