388139904 has 256 divisors, whose sum is σ = 1263168000. Its totient is φ = 116785152.

The previous prime is 388139891. The next prime is 388139929. The reversal of 388139904 is 409931883.

It is a self number, because there is not a number n which added to its sum of digits gives 388139904.

It is a congruent number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 1510144 + ... + 1510400.

It is an arithmetic number, because the mean of its divisors is an integer number (4934250).

Almost surely, 2^388139904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388139904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631584000).

388139904 is an abundant number, since it is smaller than the sum of its proper divisors (875028096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388139904 is a wasteful number, since it uses less digits than its factorization.

388139904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 388139904 is about 19701.2665582698. The cubic root of 388139904 is about 729.4509563974.

The spelling of 388139904 in words is "three hundred eighty-eight million, one hundred thirty-nine thousand, nine hundred four".