256444593 has 16 divisors (see below), whose sum is σ = 354170880. Its totient is φ = 164855936.

The previous prime is 256444589. The next prime is 256444603. The reversal of 256444593 is 395444652.

It is a cyclic number.

It is not a de Polignac number, because 256444593 - 2² = 256444589 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256444523) 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, 94096 + ... + 96782.

It is an arithmetic number, because the mean of its divisors is an integer number (22135680).

Almost surely, 2^256444593 is an apocalyptic number.

It is an amenable number.

256444593 is a deficient number, since it is larger than the sum of its proper divisors (97726287).

256444593 is a wasteful number, since it uses less digits than its factorization.

256444593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816.

The product of its digits is 518400, while the sum is 42.

The square root of 256444593 is about 16013.8875042883. The cubic root of 256444593 is about 635.3277849719.

The spelling of 256444593 in words is "two hundred fifty-six million, four hundred forty-four thousand, five hundred ninety-three".