56139873 has 4 divisors (see below), whose sum is σ = 74853168. Its totient is φ = 37426580.

The previous prime is 56139871. The next prime is 56139887. The reversal of 56139873 is 37893165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56139873 - 2¹ = 56139871 is a prime.

It is a super-2 number, since 2×56139873² = 6303370680912258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56139871) 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, 9356643 + ... + 9356648.

It is an arithmetic number, because the mean of its divisors is an integer number (18713292).

Almost surely, 2^56139873 is an apocalyptic number.

It is an amenable number.

56139873 is a deficient number, since it is larger than the sum of its proper divisors (18713295).

56139873 is a wasteful number, since it uses less digits than its factorization.

56139873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18713294.

The product of its digits is 136080, while the sum is 42.

The square root of 56139873 is about 7492.6546030095. The cubic root of 56139873 is about 382.9045043656.

The spelling of 56139873 in words is "fifty-six million, one hundred thirty-nine thousand, eight hundred seventy-three".