397994831 has 24 divisors (see below), whose sum is σ = 448247520. Its totient is φ = 352934400.

The previous prime is 397994827. The next prime is 397994867. The reversal of 397994831 is 138499793.

It is a happy number.

It is not a de Polignac number, because 397994831 - 2² = 397994827 is a prime.

It is a super-2 number, since 2×397994831² = 316799771005437122, 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 (397994801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 491555 + ... + 492363.

It is an arithmetic number, because the mean of its divisors is an integer number (18676980).

Almost surely, 2^397994831 is an apocalyptic number.

397994831 is a deficient number, since it is larger than the sum of its proper divisors (50252689).

397994831 is a wasteful number, since it uses less digits than its factorization.

397994831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947 (or 934 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 53.

The square root of 397994831 is about 19949.8077935603. The cubic root of 397994831 is about 735.5730524096.

The spelling of 397994831 in words is "three hundred ninety-seven million, nine hundred ninety-four thousand, eight hundred thirty-one".