256765939 has 4 divisors (see below), whose sum is σ = 257281000. Its totient is φ = 256250880.

The previous prime is 256765877. The next prime is 256765961. The reversal of 256765939 is 939567652.

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

It is a cyclic number.

It is not a de Polignac number, because 256765939 - 2¹³ = 256757747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256765139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256782 + ... + 257779.

It is an arithmetic number, because the mean of its divisors is an integer number (64320250).

Almost surely, 2^256765939 is an apocalyptic number.

256765939 is a deficient number, since it is larger than the sum of its proper divisors (515061).

256765939 is an equidigital number, since it uses as much as digits as its factorization.

256765939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515060.

The product of its digits is 3061800, while the sum is 52.

The square root of 256765939 is about 16023.9177169630. The cubic root of 256765939 is about 635.5930467229.

The spelling of 256765939 in words is "two hundred fifty-six million, seven hundred sixty-five thousand, nine hundred thirty-nine".