56405839 has 4 divisors (see below), whose sum is σ = 64463824. Its totient is φ = 48347856.

The previous prime is 56405837. The next prime is 56405857. The reversal of 56405839 is 93850465.

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 56405839 - 2¹ = 56405837 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 (56405831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4028982 + ... + 4028995.

It is an arithmetic number, because the mean of its divisors is an integer number (16115956).

Almost surely, 2^56405839 is an apocalyptic number.

56405839 is a deficient number, since it is larger than the sum of its proper divisors (8057985).

56405839 is an equidigital number, since it uses as much as digits as its factorization.

56405839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8057984.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 56405839 is about 7510.3820808265. The cubic root of 56405839 is about 383.5082296220.

The spelling of 56405839 in words is "fifty-six million, four hundred five thousand, eight hundred thirty-nine".