398367920 has 20 divisors (see below), whose sum is σ = 926205600. Its totient is φ = 159347136.

The previous prime is 398367899. The next prime is 398367923. The reversal of 398367920 is 29763893.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (398367923) 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 3 ways as a sum of consecutive naturals, for example, 2489720 + ... + 2489879.

It is an arithmetic number, because the mean of its divisors is an integer number (46310280).

Almost surely, 2^398367920 is an apocalyptic number.

It is an amenable number.

398367920 is an abundant number, since it is smaller than the sum of its proper divisors (527837680).

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

398367920 is a wasteful number, since it uses less digits than its factorization.

398367920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4979612 (or 4979606 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 398367920 is about 19959.1562947936. The cubic root of 398367920 is about 735.8028280116.

The spelling of 398367920 in words is "three hundred ninety-eight million, three hundred sixty-seven thousand, nine hundred twenty".