388139808 has 48 divisors (see below), whose sum is σ = 1164421440. Its totient is φ = 110896896.

The previous prime is 388139803. The next prime is 388139821. The reversal of 388139808 is 808931883.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (388139803) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 288123 + ... + 289466.

It is an arithmetic number, because the mean of its divisors is an integer number (24258780).

Almost surely, 2^388139808 is an apocalyptic number.

It is an amenable number.

388139808 is an abundant number, since it is smaller than the sum of its proper divisors (776281632).

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

388139808 is a wasteful number, since it uses less digits than its factorization.

388139808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577609 (or 577601 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 388139808 is about 19701.2641218781. The cubic root of 388139808 is about 729.4508962581.

The spelling of 388139808 in words is "three hundred eighty-eight million, one hundred thirty-nine thousand, eight hundred eight".