398465815 has 32 divisors (see below), whose sum is σ = 554883840. Its totient is φ = 271641600.

The previous prime is 398465807. The next prime is 398465831. The reversal of 398465815 is 518564893.

It is not a de Polignac number, because 398465815 - 2³ = 398465807 is a prime.

It is a super-2 number, since 2×398465815² = 317550011447228450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99400 + ... + 103330.

It is an arithmetic number, because the mean of its divisors is an integer number (17340120).

Almost surely, 2^398465815 is an apocalyptic number.

398465815 is a deficient number, since it is larger than the sum of its proper divisors (156418025).

398465815 is a wasteful number, since it uses less digits than its factorization.

398465815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063.

The product of its digits is 1036800, while the sum is 49.

The square root of 398465815 is about 19961.6085273707. The cubic root of 398465815 is about 735.8630951790.

The spelling of 398465815 in words is "three hundred ninety-eight million, four hundred sixty-five thousand, eight hundred fifteen".