397621431 has 6 divisors (see below), whose sum is σ = 574342080. Its totient is φ = 265080948.

The previous prime is 397621429. The next prime is 397621487. The reversal of 397621431 is 134126793.

It is not a de Polignac number, because 397621431 - 2¹ = 397621429 is a prime.

It is a super-2 number, since 2×397621431² = 316205604780975522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397628431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22090071 + ... + 22090088.

It is an arithmetic number, because the mean of its divisors is an integer number (95723680).

Almost surely, 2^397621431 is an apocalyptic number.

397621431 is a deficient number, since it is larger than the sum of its proper divisors (176720649).

397621431 is a wasteful number, since it uses less digits than its factorization.

397621431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44180165 (or 44180162 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 397621431 is about 19940.4471113363. The cubic root of 397621431 is about 735.3429414486.

The spelling of 397621431 in words is "three hundred ninety-seven million, six hundred twenty-one thousand, four hundred thirty-one".