398928 has 20 divisors (see below), whose sum is σ = 1030688. Its totient is φ = 132960.

The previous prime is 398921. The next prime is 398933. The reversal of 398928 is 829893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398921) by changing a digit.

398928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 4108 + ... + 4203.

2³⁹⁸⁹²⁸ is an apocalyptic number.

It is an amenable number.

398928 is an abundant number, since it is smaller than the sum of its proper divisors (631760).

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

398928 is a wasteful number, since it uses less digits than its factorization.

398928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8322 (or 8316 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 398928 is about 631.6074730400. The cubic root of 398928 is about 73.6147497219.

It can be divided in two parts, 398 and 928, that added together give a triangular number (1326 = T₅₁).

The spelling of 398928 in words is "three hundred ninety-eight thousand, nine hundred twenty-eight".