256813383 has 8 divisors (see below), whose sum is σ = 342493696. Its totient is φ = 171171000.

The previous prime is 256813379. The next prime is 256813399. The reversal of 256813383 is 383318652.

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

It is not a de Polignac number, because 256813383 - 2² = 256813379 is a prime.

It is a super-2 number, since 2×256813383² = 131906227375809378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256813303) 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, 16458 + ... + 28008.

It is an arithmetic number, because the mean of its divisors is an integer number (42811712).

Almost surely, 2^256813383 is an apocalyptic number.

256813383 is a deficient number, since it is larger than the sum of its proper divisors (85680313).

256813383 is a wasteful number, since it uses less digits than its factorization.

256813383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18965.

The product of its digits is 103680, while the sum is 39.

The square root of 256813383 is about 16025.3980605787. The cubic root of 256813383 is about 635.6321916078.

It can be divided in two parts, 2568 and 13383, that added together give a palindrome (15951).

The spelling of 256813383 in words is "two hundred fifty-six million, eight hundred thirteen thousand, three hundred eighty-three".