256097907 has 12 divisors (see below), whose sum is σ = 398374704. Its totient is φ = 157598640.

The previous prime is 256097899. The next prime is 256097969. The reversal of 256097907 is 709790652.

It is not a de Polignac number, because 256097907 - 2³ = 256097899 is a prime.

It is a super-2 number, since 2×256097907² = 131172275939561298, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (256097977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1094319 + ... + 1094552.

It is an arithmetic number, because the mean of its divisors is an integer number (33197892).

Almost surely, 2^256097907 is an apocalyptic number.

256097907 is a deficient number, since it is larger than the sum of its proper divisors (142276797).

256097907 is a wasteful number, since it uses less digits than its factorization.

256097907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188890 (or 2188887 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 256097907 is about 16003.0593012711. The cubic root of 256097907 is about 635.0413571758.

The spelling of 256097907 in words is "two hundred fifty-six million, ninety-seven thousand, nine hundred seven".