638837396 has 24 divisors (see below), whose sum is σ = 1131570720. Its totient is φ = 315555552.

The previous prime is 638837393. The next prime is 638837411. The reversal of 638837396 is 693738836.

It is a super-2 number, since 2×638837396² = 816226437056121632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638837393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109571 + ... + 115253.

It is an arithmetic number, because the mean of its divisors is an integer number (47148780).

Almost surely, 2^638837396 is an apocalyptic number.

It is an amenable number.

638837396 is a deficient number, since it is larger than the sum of its proper divisors (492733324).

638837396 is a wasteful number, since it uses less digits than its factorization.

638837396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023 (or 6021 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 53.

The square root of 638837396 is about 25275.2328574832. The cubic root of 638837396 is about 861.2517358863.

The spelling of 638837396 in words is "six hundred thirty-eight million, eight hundred thirty-seven thousand, three hundred ninety-six".