397621 has 8 divisors (see below), whose sum is σ = 465344. Its totient is φ = 332640.

The previous prime is 397597. The next prime is 397633. The reversal of 397621 is 126793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397621 - 2⁵ = 397589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360 + ... + 961.

It is an arithmetic number, because the mean of its divisors is an integer number (58168).

2³⁹⁷⁶²¹ is an apocalyptic number.

It is an amenable number.

397621 is a deficient number, since it is larger than the sum of its proper divisors (67723).

397621 is a wasteful number, since it uses less digits than its factorization.

397621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its digits is 2268, while the sum is 28.

The square root of 397621 is about 630.5719625863. The cubic root of 397621 is about 73.5342675758.

The spelling of 397621 in words is "three hundred ninety-seven thousand, six hundred twenty-one".