256746239 has 4 divisors (see below), whose sum is σ = 256788120. Its totient is φ = 256704360.

The previous prime is 256746209. The next prime is 256746241. The reversal of 256746239 is 932647652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256746239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256746239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256746209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9752 + ... + 24669.

It is an arithmetic number, because the mean of its divisors is an integer number (64197030).

Almost surely, 2^256746239 is an apocalyptic number.

256746239 is a deficient number, since it is larger than the sum of its proper divisors (41881).

256746239 is an equidigital number, since it uses as much as digits as its factorization.

256746239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41880.

The product of its digits is 544320, while the sum is 44.

The square root of 256746239 is about 16023.3029990698. The cubic root of 256746239 is about 635.5767913175.

It can be divided in two parts, 25674 and 6239, that added together give a palindrome (31913).

The spelling of 256746239 in words is "two hundred fifty-six million, seven hundred forty-six thousand, two hundred thirty-nine".