398128 has 20 divisors (see below), whose sum is σ = 781200. Its totient is φ = 196544.

The previous prime is 398119. The next prime is 398129. The reversal of 398128 is 821893.

It is a self number, because there is not a number n which added to its sum of digits gives 398128.

It is not an unprimeable number, because it can be changed into a prime (398129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2301 + ... + 2467.

It is an arithmetic number, because the mean of its divisors is an integer number (39060).

2³⁹⁸¹²⁸ is an apocalyptic number.

It is an amenable number.

398128 is a deficient number, since it is larger than the sum of its proper divisors (383072).

398128 is a wasteful number, since it uses less digits than its factorization.

398128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 318 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 398128 is about 630.9738504883. The cubic root of 398128 is about 73.5655084132.

The spelling of 398128 in words is "three hundred ninety-eight thousand, one hundred twenty-eight".