397924 has 12 divisors (see below), whose sum is σ = 709884. Its totient is φ = 195104.

The previous prime is 397921. The next prime is 397939. The reversal of 397924 is 429793.

It can be written as a sum of positive squares in 2 ways, for example, as 268324 + 129600 = 518^2 + 360^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 397924.

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 in 3 ways as a sum of consecutive naturals, for example, 727 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (59157).

2³⁹⁷⁹²⁴ is an apocalyptic number.

It is an amenable number.

397924 is a deficient number, since it is larger than the sum of its proper divisors (311960).

397924 is a wasteful number, since it uses less digits than its factorization.

397924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934 (or 1932 counting only the distinct ones).

The product of its digits is 13608, while the sum is 34.

The square root of 397924 is about 630.8121748984. The cubic root of 397924 is about 73.5529413262.

The spelling of 397924 in words is "three hundred ninety-seven thousand, nine hundred twenty-four".