256939859 has 8 divisors (see below), whose sum is σ = 283074480. Its totient is φ = 231268000.

The previous prime is 256939843. The next prime is 256939883. The reversal of 256939859 is 958939652.

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

It is a cyclic number.

It is not a de Polignac number, because 256939859 - 2⁴ = 256939843 is a prime.

It is a super-2 number, since 2×256939859² = 132036182285879762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256939829) 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, 114524 + ... + 116745.

It is an arithmetic number, because the mean of its divisors is an integer number (35384310).

Almost surely, 2^256939859 is an apocalyptic number.

256939859 is a deficient number, since it is larger than the sum of its proper divisors (26134621).

256939859 is a wasteful number, since it uses less digits than its factorization.

256939859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231381.

The product of its digits is 5248800, while the sum is 56.

The square root of 256939859 is about 16029.3436858781. The cubic root of 256939859 is about 635.7365203133.

The spelling of 256939859 in words is "two hundred fifty-six million, nine hundred thirty-nine thousand, eight hundred fifty-nine".