398889928 has 32 divisors (see below), whose sum is σ = 762480000. Its totient is φ = 195592320.

The previous prime is 398889923. The next prime is 398889941. The reversal of 398889928 is 829988893.

It is a super-2 number, since 2×398889928² = 318226349319690368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 398889928.

It is not an unprimeable number, because it can be changed into a prime (398889923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111268 + ... + 114796.

It is an arithmetic number, because the mean of its divisors is an integer number (23827500).

Almost surely, 2^398889928 is an apocalyptic number.

It is an amenable number.

398889928 is a deficient number, since it is larger than the sum of its proper divisors (363590072).

398889928 is a wasteful number, since it uses less digits than its factorization.

398889928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805 (or 3801 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 64.

The square root of 398889928 is about 19972.2289191767. The cubic root of 398889928 is about 736.1240782069.

The spelling of 398889928 in words is "three hundred ninety-eight million, eight hundred eighty-nine thousand, nine hundred twenty-eight".