397624621 has 8 divisors (see below), whose sum is σ = 415238400. Its totient is φ = 380038032.

The previous prime is 397624589. The next prime is 397624639. The reversal of 397624621 is 126426793.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 397624621 - 2⁵ = 397624589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397624691) 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, 26655 + ... + 38803.

It is an arithmetic number, because the mean of its divisors is an integer number (51904800).

Almost surely, 2^397624621 is an apocalyptic number.

It is an amenable number.

397624621 is a deficient number, since it is larger than the sum of its proper divisors (17613779).

397624621 is a wasteful number, since it uses less digits than its factorization.

397624621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13595.

The product of its digits is 108864, while the sum is 40.

The square root of 397624621 is about 19940.5270993522. The cubic root of 397624621 is about 735.3449079235.

The spelling of 397624621 in words is "three hundred ninety-seven million, six hundred twenty-four thousand, six hundred twenty-one".