623638837 has 2 divisors, whose sum is σ = 623638838. Its totient is φ = 623638836.

The previous prime is 623638789. The next prime is 623638849. The reversal of 623638837 is 738836326.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581726161 + 41912676 = 24119^2 + 6474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623638837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623630837) 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 as a sum of consecutive naturals, namely, 311819418 + 311819419.

It is an arithmetic number, because the mean of its divisors is an integer number (311819419).

Almost surely, 2^623638837 is an apocalyptic number.

It is an amenable number.

623638837 is a deficient number, since it is larger than the sum of its proper divisors (1).

623638837 is an equidigital number, since it uses as much as digits as its factorization.

623638837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 46.

The square root of 623638837 is about 24972.7619017200. The cubic root of 623638837 is about 854.3668406091.

The spelling of 623638837 in words is "six hundred twenty-three million, six hundred thirty-eight thousand, eight hundred thirty-seven".