398115820 has 12 divisors (see below), whose sum is σ = 836043264. Its totient is φ = 159246320.

The previous prime is 398115811. The next prime is 398115827. The reversal of 398115820 is 28511893.

It is a super-2 number, since 2×398115820² = 316992412268544800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 398115820.

It is not an unprimeable number, because it can be changed into a prime (398115827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9952876 + ... + 9952915.

It is an arithmetic number, because the mean of its divisors is an integer number (69670272).

Almost surely, 2^398115820 is an apocalyptic number.

It is an amenable number.

398115820 is an abundant number, since it is smaller than the sum of its proper divisors (437927444).

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

398115820 is a wasteful number, since it uses less digits than its factorization.

398115820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19905800 (or 19905798 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 398115820 is about 19952.8398981198. The cubic root of 398115820 is about 735.6475820470.

The spelling of 398115820 in words is "three hundred ninety-eight million, one hundred fifteen thousand, eight hundred twenty".