56391937 has 16 divisors (see below), whose sum is σ = 65474560. Its totient is φ = 47573568.

The previous prime is 56391931. The next prime is 56391961. The reversal of 56391937 is 73919365.

It is a happy number.

It is not a de Polignac number, because 56391937 - 2¹¹ = 56389889 is a prime.

It is a super-2 number, since 2×56391937² = 6360101117223938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56391893 and 56391902.

It is not an unprimeable number, because it can be changed into a prime (56391931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203443 + ... + 203719.

It is an arithmetic number, because the mean of its divisors is an integer number (4092160).

Almost surely, 2^56391937 is an apocalyptic number.

It is an amenable number.

56391937 is a deficient number, since it is larger than the sum of its proper divisors (9082623).

56391937 is a wasteful number, since it uses less digits than its factorization.

56391937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its digits is 153090, while the sum is 43.

The square root of 56391937 is about 7509.4565049676. The cubic root of 56391937 is about 383.4767200622.

The spelling of 56391937 in words is "fifty-six million, three hundred ninety-one thousand, nine hundred thirty-seven".