56857397 has 4 divisors (see below), whose sum is σ = 56881440. Its totient is φ = 56833356.

The previous prime is 56857391. The next prime is 56857417. The reversal of 56857397 is 79375865.

It is a happy number.

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 56857397 - 2²⁰ = 55808821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56857391) 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, 8033 + ... + 13350.

It is an arithmetic number, because the mean of its divisors is an integer number (14220360).

Almost surely, 2^56857397 is an apocalyptic number.

It is an amenable number.

56857397 is a deficient number, since it is larger than the sum of its proper divisors (24043).

56857397 is a wasteful number, since it uses less digits than its factorization.

56857397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24042.

The product of its digits is 1587600, while the sum is 50.

The square root of 56857397 is about 7540.3844066467. The cubic root of 56857397 is about 384.5289048736.

The spelling of 56857397 in words is "fifty-six million, eight hundred fifty-seven thousand, three hundred ninety-seven".