398913879 has 32 divisors (see below), whose sum is σ = 677214720. Its totient is φ = 203156352.

The previous prime is 398913877. The next prime is 398913899. The reversal of 398913879 is 978319893.

It is not a de Polignac number, because 398913879 - 2¹ = 398913877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398913877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17277 + ... + 33110.

It is an arithmetic number, because the mean of its divisors is an integer number (21162960).

Almost surely, 2^398913879 is an apocalyptic number.

398913879 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

398913879 is a deficient number, since it is larger than the sum of its proper divisors (278300841).

398913879 is a wasteful number, since it uses less digits than its factorization.

398913879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50439.

The product of its digits is 2939328, while the sum is 57.

The square root of 398913879 is about 19972.8285177638. The cubic root of 398913879 is about 736.1388112227.

The spelling of 398913879 in words is "three hundred ninety-eight million, nine hundred thirteen thousand, eight hundred seventy-nine".