398912520 has 64 divisors (see below), whose sum is σ = 1199499840. Its totient is φ = 106131200.

The previous prime is 398912491. The next prime is 398912533. The reversal of 398912520 is 25219893.

It is a super-2 number, since 2×398912520² = 318262397225500800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51715 + ... + 58925.

It is an arithmetic number, because the mean of its divisors is an integer number (18742185).

Almost surely, 2^398912520 is an apocalyptic number.

398912520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398912520 is an abundant number, since it is smaller than the sum of its proper divisors (800587320).

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

398912520 is a wasteful number, since it uses less digits than its factorization.

398912520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686 (or 7682 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 398912520 is about 19972.7944965145. The cubic root of 398912520 is about 736.1379752747.

The spelling of 398912520 in words is "three hundred ninety-eight million, nine hundred twelve thousand, five hundred twenty".