398012868 has 72 divisors (see below), whose sum is σ = 1099818720. Its totient is φ = 120360960.

The previous prime is 398012833. The next prime is 398012903. The reversal of 398012868 is 868210893.

It is an interprime number because it is at equal distance from previous prime (398012833) and next prime (398012903).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303871 + ... + 305177.

It is an arithmetic number, because the mean of its divisors is an integer number (15275260).

Almost surely, 2^398012868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398012868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (549909360).

398012868 is an abundant number, since it is smaller than the sum of its proper divisors (701805852).

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

398012868 is a wasteful number, since it uses less digits than its factorization.

398012868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097 (or 2092 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 398012868 is about 19950.2598479318. The cubic root of 398012868 is about 735.5841642212.

The spelling of 398012868 in words is "three hundred ninety-eight million, twelve thousand, eight hundred sixty-eight".