397185631 has 8 divisors (see below), whose sum is σ = 401577264. Its totient is φ = 392803200.

The previous prime is 397185629. The next prime is 397185641. The reversal of 397185631 is 136581793.

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 397185631 - 2¹ = 397185629 is a prime.

It is a super-2 number, since 2×397185631² = 315512850945736322, 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 (397185641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118231 + ... + 121543.

It is an arithmetic number, because the mean of its divisors is an integer number (50197158).

Almost surely, 2^397185631 is an apocalyptic number.

397185631 is a deficient number, since it is larger than the sum of its proper divisors (4391633).

397185631 is a wasteful number, since it uses less digits than its factorization.

397185631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601.

The product of its digits is 136080, while the sum is 43.

The square root of 397185631 is about 19929.5165771777. The cubic root of 397185631 is about 735.0741936920.

The spelling of 397185631 in words is "three hundred ninety-seven million, one hundred eighty-five thousand, six hundred thirty-one".