56138986 has 4 divisors (see below), whose sum is σ = 84208482. Its totient is φ = 28069492.

The previous prime is 56138917. The next prime is 56138987. The reversal of 56138986 is 68983165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68983165 = 5 ⋅13796633.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 15752961 = 6355^2 + 3969^2 .

It is not an unprimeable number, because it can be changed into a prime (56138987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14034745 + ... + 14034748.

Almost surely, 2^56138986 is an apocalyptic number.

56138986 is a deficient number, since it is larger than the sum of its proper divisors (28069496).

56138986 is a wasteful number, since it uses less digits than its factorization.

56138986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28069495.

The product of its digits is 311040, while the sum is 46.

The square root of 56138986 is about 7492.5954114712. The cubic root of 56138986 is about 382.9024877473.

The spelling of 56138986 in words is "fifty-six million, one hundred thirty-eight thousand, nine hundred eighty-six".