256427439 has 16 divisors (see below), whose sum is σ = 381070080. Its totient is φ = 152426880.

The previous prime is 256427419. The next prime is 256427453. The reversal of 256427439 is 934724652.

It is not a de Polignac number, because 256427439 - 2⁹ = 256426927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256427439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256427419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131347 + ... + 133284.

It is an arithmetic number, because the mean of its divisors is an integer number (23816880).

Almost surely, 2^256427439 is an apocalyptic number.

256427439 is a deficient number, since it is larger than the sum of its proper divisors (124642641).

256427439 is a wasteful number, since it uses less digits than its factorization.

256427439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264670.

The product of its digits is 362880, while the sum is 42.

The square root of 256427439 is about 16013.3518977134. The cubic root of 256427439 is about 635.3136186164.

It can be divided in two parts, 2564 and 27439, that added together give a palindrome (30003).

The spelling of 256427439 in words is "two hundred fifty-six million, four hundred twenty-seven thousand, four hundred thirty-nine".