388142638 has 48 divisors (see below), whose sum is σ = 657429696. Its totient is φ = 171649920.

The previous prime is 388142581. The next prime is 388142663. The reversal of 388142638 is 836241883.

Its product of digits (221184) is a multiple of the sum of its prime divisors (576).

It is a junction number, because it is equal to n+sod(n) for n = 388142594 and 388142603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841728 + ... + 842188.

It is an arithmetic number, because the mean of its divisors is an integer number (13696452).

Almost surely, 2^388142638 is an apocalyptic number.

388142638 is a deficient number, since it is larger than the sum of its proper divisors (269287058).

388142638 is a wasteful number, since it uses less digits than its factorization.

388142638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589 (or 576 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 388142638 is about 19701.3359445495. The cubic root of 388142638 is about 729.4526691082.

The spelling of 388142638 in words is "three hundred eighty-eight million, one hundred forty-two thousand, six hundred thirty-eight".