56432391 has 4 divisors (see below), whose sum is σ = 75243192. Its totient is φ = 37621592.

The previous prime is 56432377. The next prime is 56432407. The reversal of 56432391 is 19323465.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56432391 - 2¹⁰ = 56431367 is a prime.

It is a super-2 number, since 2×56432391² = 6369229507953762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56432351) 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, 9405396 + ... + 9405401.

It is an arithmetic number, because the mean of its divisors is an integer number (18810798).

Almost surely, 2^56432391 is an apocalyptic number.

56432391 is a deficient number, since it is larger than the sum of its proper divisors (18810801).

56432391 is a wasteful number, since it uses less digits than its factorization.

56432391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18810800.

The product of its digits is 19440, while the sum is 33.

The square root of 56432391 is about 7512.1495592141. The cubic root of 56432391 is about 383.5683966384.

The spelling of 56432391 in words is "fifty-six million, four hundred thirty-two thousand, three hundred ninety-one".