256960393 has 16 divisors (see below), whose sum is σ = 272543616. Its totient is φ = 241781760.

The previous prime is 256960391. The next prime is 256960433. The reversal of 256960393 is 393069652.

It is a cyclic number.

It is not a de Polignac number, because 256960393 - 2¹ = 256960391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256960391) 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, 474703 + ... + 475243.

It is an arithmetic number, because the mean of its divisors is an integer number (17033976).

Almost surely, 2^256960393 is an apocalyptic number.

256960393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256960393 is a deficient number, since it is larger than the sum of its proper divisors (15583223).

256960393 is a wasteful number, since it uses less digits than its factorization.

256960393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 262440, while the sum is 43.

The square root of 256960393 is about 16029.9841858936. The cubic root of 256960393 is about 635.7534553606.

The spelling of 256960393 in words is "two hundred fifty-six million, nine hundred sixty thousand, three hundred ninety-three".