256426589 has 16 divisors (see below), whose sum is σ = 277567488. Its totient is φ = 236017152.

The previous prime is 256426571. The next prime is 256426607. The reversal of 256426589 is 985624652.

It is a happy number.

256426589 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256426571) and next prime (256426607).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256426589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256426529) 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, 156794 + ... + 158420.

It is an arithmetic number, because the mean of its divisors is an integer number (17347968).

Almost surely, 2^256426589 is an apocalyptic number.

It is an amenable number.

256426589 is a deficient number, since it is larger than the sum of its proper divisors (21140899).

256426589 is a wasteful number, since it uses less digits than its factorization.

256426589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its digits is 1036800, while the sum is 47.

The square root of 256426589 is about 16013.3253573391. The cubic root of 256426589 is about 635.3129166411.

The spelling of 256426589 in words is "two hundred fifty-six million, four hundred twenty-six thousand, five hundred eighty-nine".