56389381 has 4 divisors (see below), whose sum is σ = 56795200. Its totient is φ = 55983564.

The previous prime is 56389379. The next prime is 56389423. The reversal of 56389381 is 18398365.

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 56389381 - 2¹ = 56389379 is a prime.

It is a super-2 number, since 2×56389381² = 6359524579126322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56389181) 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, 202701 + ... + 202978.

It is an arithmetic number, because the mean of its divisors is an integer number (14198800).

Almost surely, 2^56389381 is an apocalyptic number.

It is an amenable number.

56389381 is a deficient number, since it is larger than the sum of its proper divisors (405819).

56389381 is a wasteful number, since it uses less digits than its factorization.

56389381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405818.

The product of its digits is 155520, while the sum is 43.

The square root of 56389381 is about 7509.2863176203. The cubic root of 56389381 is about 383.4709262002.

The spelling of 56389381 in words is "fifty-six million, three hundred eighty-nine thousand, three hundred eighty-one".