397837631 has 8 divisors (see below), whose sum is σ = 415201680. Its totient is φ = 380716672.

The previous prime is 397837619. The next prime is 397837633. The reversal of 397837631 is 136738793.

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 397837631 - 2¹⁸ = 397575487 is a prime.

It is a super-2 number, since 2×397837631² = 316549561279384322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397837633) 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, 57425 + ... + 63978.

It is an arithmetic number, because the mean of its divisors is an integer number (51900210).

Almost surely, 2^397837631 is an apocalyptic number.

397837631 is a deficient number, since it is larger than the sum of its proper divisors (17364049).

397837631 is a wasteful number, since it uses less digits than its factorization.

397837631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121545.

The product of its digits is 571536, while the sum is 47.

The square root of 397837631 is about 19945.8675168567. The cubic root of 397837631 is about 735.4761941070.

The spelling of 397837631 in words is "three hundred ninety-seven million, eight hundred thirty-seven thousand, six hundred thirty-one".