398939870 has 64 divisors (see below), whose sum is σ = 846028800. Its totient is φ = 135376416.

The previous prime is 398939857. The next prime is 398939897. The reversal of 398939870 is 78939893.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366467 + ... + 367553.

It is an arithmetic number, because the mean of its divisors is an integer number (13219200).

Almost surely, 2^398939870 is an apocalyptic number.

398939870 is an abundant number, since it is smaller than the sum of its proper divisors (447088930).

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

398939870 is a wasteful number, since it uses less digits than its factorization.

398939870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 398939870 is about 19973.4791661343. The cubic root of 398939870 is about 736.1547984398.

The spelling of 398939870 in words is "three hundred ninety-eight million, nine hundred thirty-nine thousand, eight hundred seventy".