398928428 has 24 divisors (see below), whose sum is σ = 704894400. Its totient is φ = 197538560.

The previous prime is 398928419. The next prime is 398928449. The reversal of 398928428 is 824829893.

It is a self number, because there is not a number n which added to its sum of digits gives 398928428.

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, 256100 + ... + 257652.

It is an arithmetic number, because the mean of its divisors is an integer number (29370600).

Almost surely, 2^398928428 is an apocalyptic number.

It is an amenable number.

398928428 is a deficient number, since it is larger than the sum of its proper divisors (305965972).

398928428 is a wasteful number, since it uses less digits than its factorization.

398928428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2135 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The square root of 398928428 is about 19973.1927342626. The cubic root of 398928428 is about 736.1477604838.

The spelling of 398928428 in words is "three hundred ninety-eight million, nine hundred twenty-eight thousand, four hundred twenty-eight".