388889138 has 8 divisors (see below), whose sum is σ = 636364080. Its totient is φ = 176767780.

The previous prime is 388889071. The next prime is 388889147. The reversal of 388889138 is 831988883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8838368 + ... + 8838411.

It is an arithmetic number, because the mean of its divisors is an integer number (79545510).

Almost surely, 2^388889138 is an apocalyptic number.

388889138 is a deficient number, since it is larger than the sum of its proper divisors (247474942).

388889138 is a wasteful number, since it uses less digits than its factorization.

388889138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17676792.

The product of its digits is 2654208, while the sum is 56.

The square root of 388889138 is about 19720.2722597838. The cubic root of 388889138 is about 729.9200125032.

The spelling of 388889138 in words is "three hundred eighty-eight million, eight hundred eighty-nine thousand, one hundred thirty-eight".