56639923 has 2 divisors, whose sum is σ = 56639924. Its totient is φ = 56639922.

The previous prime is 56639879. The next prime is 56639951. The reversal of 56639923 is 32993665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56639923 - 2⁹ = 56639411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56639923.

It is not a weakly prime, because it can be changed into another prime (56639963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28319961 + 28319962.

It is an arithmetic number, because the mean of its divisors is an integer number (28319962).

Almost surely, 2^56639923 is an apocalyptic number.

56639923 is a deficient number, since it is larger than the sum of its proper divisors (1).

56639923 is an equidigital number, since it uses as much as digits as its factorization.

56639923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 43.

The square root of 56639923 is about 7525.9499732592. The cubic root of 56639923 is about 384.0380166174.

The spelling of 56639923 in words is "fifty-six million, six hundred thirty-nine thousand, nine hundred twenty-three".