256465939 has 8 divisors (see below), whose sum is σ = 268100640. Its totient is φ = 244871616.

The previous prime is 256465931. The next prime is 256465943. The reversal of 256465939 is 939564652.

It is a happy number.

256465939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256465939 - 2³ = 256465931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256465892 and 256465901.

It is not an unprimeable number, because it can be changed into a prime (256465931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3289 + ... + 22885.

It is an arithmetic number, because the mean of its divisors is an integer number (33512580).

Almost surely, 2^256465939 is an apocalyptic number.

256465939 is a deficient number, since it is larger than the sum of its proper divisors (11634701).

256465939 is a wasteful number, since it uses less digits than its factorization.

256465939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20189.

The product of its digits is 1749600, while the sum is 49.

The square root of 256465939 is about 16014.5539744321. The cubic root of 256465939 is about 635.3454123412.

The spelling of 256465939 in words is "two hundred fifty-six million, four hundred sixty-five thousand, nine hundred thirty-nine".