398912868 has 36 divisors (see below), whose sum is σ = 1009443708. Its totient is φ = 132828480.

The previous prime is 398912819. The next prime is 398912869. The reversal of 398912868 is 868219893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 223562304 + 175350564 = 14952^2 + 13242^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (398912869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31330 + ... + 42182.

It is an arithmetic number, because the mean of its divisors is an integer number (28040103).

Almost surely, 2^398912868 is an apocalyptic number.

It is an amenable number.

398912868 is an abundant number, since it is smaller than the sum of its proper divisors (610530840).

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

398912868 is a wasteful number, since it uses less digits than its factorization.

398912868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11884 (or 11879 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 398912868 is about 19972.8032083631. The cubic root of 398912868 is about 736.1381893367.

The spelling of 398912868 in words is "three hundred ninety-eight million, nine hundred twelve thousand, eight hundred sixty-eight".