398591166 has 32 divisors (see below), whose sum is σ = 817090560. Its totient is φ = 129556224.

The previous prime is 398591143. The next prime is 398591183. The reversal of 398591166 is 661195893.

It is a super-2 number, since 2×398591166² = 317749835226479112, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) 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 15 ways as a sum of consecutive naturals, for example, 238851 + ... + 240513.

It is an arithmetic number, because the mean of its divisors is an integer number (25534080).

Almost surely, 2^398591166 is an apocalyptic number.

398591166 is an abundant number, since it is smaller than the sum of its proper divisors (418499394).

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

398591166 is a wasteful number, since it uses less digits than its factorization.

398591166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640.

The product of its digits is 349920, while the sum is 48.

The square root of 398591166 is about 19964.7480825579. The cubic root of 398591166 is about 735.9402506927.

The spelling of 398591166 in words is "three hundred ninety-eight million, five hundred ninety-one thousand, one hundred sixty-six".