398158920 has 48 divisors (see below), whose sum is σ = 1294017660. Its totient is φ = 106175616.

The previous prime is 398158919. The next prime is 398158931. The reversal of 398158920 is 29851893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 379548324 + 18610596 = 19482^2 + 4314^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 552639 + ... + 553358.

Almost surely, 2^398158920 is an apocalyptic number.

398158920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398158920 is an abundant number, since it is smaller than the sum of its proper divisors (895858740).

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

398158920 is a wasteful number, since it uses less digits than its factorization.

398158920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106014 (or 1106007 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 398158920 is about 19953.9199156456. The cubic root of 398158920 is about 735.6741281467.

The spelling of 398158920 in words is "three hundred ninety-eight million, one hundred fifty-eight thousand, nine hundred twenty".