638390522 has 24 divisors (see below), whose sum is σ = 1215194400. Its totient is φ = 248723160.

The previous prime is 638390521. The next prime is 638390537. The reversal of 638390522 is 225093836.

It is not an unprimeable number, because it can be changed into a prime (638390521) 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 11 ways as a sum of consecutive naturals, for example, 295022 + ... + 297177.

It is an arithmetic number, because the mean of its divisors is an integer number (50633100).

Almost surely, 2^638390522 is an apocalyptic number.

638390522 is a deficient number, since it is larger than the sum of its proper divisors (576803878).

638390522 is a wasteful number, since it uses less digits than its factorization.

638390522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592226 (or 592219 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 638390522 is about 25266.3911550502. The cubic root of 638390522 is about 861.0508705925.

The spelling of 638390522 in words is "six hundred thirty-eight million, three hundred ninety thousand, five hundred twenty-two".