397520 has 20 divisors (see below), whose sum is σ = 924420. Its totient is φ = 158976.

The previous prime is 397519. The next prime is 397541. The reversal of 397520 is 25793.

It can be written as a sum of positive squares in 2 ways, for example, as 110224 + 287296 = 332^2 + 536^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 397520.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397520.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2405 + ... + 2564.

It is an arithmetic number, because the mean of its divisors is an integer number (46221).

2³⁹⁷⁵²⁰ is an apocalyptic number.

It is an amenable number.

397520 is an abundant number, since it is smaller than the sum of its proper divisors (526900).

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

397520 is a wasteful number, since it uses less digits than its factorization.

397520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982 (or 4976 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 397520 is about 630.4918714781. The cubic root of 397520 is about 73.5280408842.

The spelling of 397520 in words is "three hundred ninety-seven thousand, five hundred twenty".