56139810 has 16 divisors (see below), whose sum is σ = 134735616. Its totient is φ = 14970608.

The previous prime is 56139799. The next prime is 56139821. The reversal of 56139810 is 1893165.

It is an interprime number because it is at equal distance from previous prime (56139799) and next prime (56139821).

It is a super-2 number, since 2×56139810² = 6303356533672200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 935634 + ... + 935693.

It is an arithmetic number, because the mean of its divisors is an integer number (8420976).

Almost surely, 2^56139810 is an apocalyptic number.

56139810 is an abundant number, since it is smaller than the sum of its proper divisors (78595806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56139810 is a wasteful number, since it uses less digits than its factorization.

56139810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871337.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 56139810 is about 7492.6503988909. The cubic root of 56139810 is about 382.9043611341.

The spelling of 56139810 in words is "fifty-six million, one hundred thirty-nine thousand, eight hundred ten".