398875687639 has 16 divisors (see below), whose sum is σ = 476291327904. Its totient is φ = 329233622400.

The previous prime is 398875687607. The next prime is 398875687643. The reversal of 398875687639 is 936786578893.

It is a cyclic number.

It is not a de Polignac number, because 398875687639 - 2⁵ = 398875687607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398875687039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22854724 + ... + 22872169.

It is an arithmetic number, because the mean of its divisors is an integer number (29768207994).

Almost surely, 2^398875687639 is an apocalyptic number.

398875687639 is a deficient number, since it is larger than the sum of its proper divisors (77415640265).

398875687639 is a wasteful number, since it uses less digits than its factorization.

398875687639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45726978.

The product of its digits is 3292047360, while the sum is 79.

The spelling of 398875687639 in words is "three hundred ninety-eight billion, eight hundred seventy-five million, six hundred eighty-seven thousand, six hundred thirty-nine".