386728638 has 16 divisors (see below), whose sum is σ = 775535376. Its totient is φ = 128563200.

The previous prime is 386728619. The next prime is 386728663. The reversal of 386728638 is 836827683.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84163 + ... + 88638.

It is an arithmetic number, because the mean of its divisors is an integer number (48470961).

Almost surely, 2^386728638 is an apocalyptic number.

386728638 is an abundant number, since it is smaller than the sum of its proper divisors (388806738).

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

386728638 is a wasteful number, since it uses less digits than its factorization.

386728638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173179.

The product of its digits is 2322432, while the sum is 51.

The square root of 386728638 is about 19665.4173105988. The cubic root of 386728638 is about 728.5657948595.

The spelling of 386728638 in words is "three hundred eighty-six million, seven hundred twenty-eight thousand, six hundred thirty-eight".