398874864 has 40 divisors (see below), whose sum is σ = 1041061840. Its totient is φ = 131586048.

The previous prime is 398874823. The next prime is 398874881. The reversal of 398874864 is 468478893.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38179 + ... + 47490.

It is an arithmetic number, because the mean of its divisors is an integer number (26026546).

Almost surely, 2^398874864 is an apocalyptic number.

It is an amenable number.

398874864 is an abundant number, since it is smaller than the sum of its proper divisors (642186976).

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

398874864 is a wasteful number, since it uses less digits than its factorization.

398874864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85777 (or 85771 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 57.

The square root of 398874864 is about 19971.8517919596. The cubic root of 398874864 is about 736.1148115630.

The spelling of 398874864 in words is "three hundred ninety-eight million, eight hundred seventy-four thousand, eight hundred sixty-four".