388638424 has 16 divisors (see below), whose sum is σ = 728988120. Its totient is φ = 194241600.

The previous prime is 388638421. The next prime is 388638431. The reversal of 388638424 is 424836883.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388638421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15399 + ... + 31849.

Almost surely, 2^388638424 is an apocalyptic number.

It is an amenable number.

388638424 is a deficient number, since it is larger than the sum of its proper divisors (340349696).

388638424 is a wasteful number, since it uses less digits than its factorization.

388638424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19410 (or 19406 counting only the distinct ones).

The product of its digits is 884736, while the sum is 46.

The square root of 388638424 is about 19713.9144768359. The cubic root of 388638424 is about 729.7631207409.

The spelling of 388638424 in words is "three hundred eighty-eight million, six hundred thirty-eight thousand, four hundred twenty-four".