398818392 has 32 divisors (see below), whose sum is σ = 1139481600. Its totient is φ = 113948064.

The previous prime is 398818391. The next prime is 398818447. The reversal of 398818392 is 293818893.

It is a super-2 number, since 2×398818392² = 318112219594931328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398818391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1186792 + ... + 1187127.

It is an arithmetic number, because the mean of its divisors is an integer number (35608800).

Almost surely, 2^398818392 is an apocalyptic number.

It is an amenable number.

398818392 is an abundant number, since it is smaller than the sum of its proper divisors (740663208).

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

398818392 is a wasteful number, since it uses less digits than its factorization.

398818392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373935 (or 2373931 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 398818392 is about 19970.4379521331. The cubic root of 398818392 is about 736.0800706444.

The spelling of 398818392 in words is "three hundred ninety-eight million, eight hundred eighteen thousand, three hundred ninety-two".