397928 has 8 divisors (see below), whose sum is σ = 746130. Its totient is φ = 198960.

The previous prime is 397921. The next prime is 397939. The reversal of 397928 is 829793.

It can be written as a sum of positive squares in only one way, i.e., 252004 + 145924 = 502^2 + 382^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 397891 and 397900.

It is not an unprimeable number, because it can be changed into a prime (397921) 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 as a sum of consecutive naturals, namely, 24863 + ... + 24878.

2³⁹⁷⁹²⁸ is an apocalyptic number.

It is an amenable number.

397928 is a deficient number, since it is larger than the sum of its proper divisors (348202).

397928 is a wasteful number, since it uses less digits than its factorization.

397928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49747 (or 49743 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 397928 is about 630.8153454062. The cubic root of 397928 is about 73.5531877809.

The spelling of 397928 in words is "three hundred ninety-seven thousand, nine hundred twenty-eight".