397072831 has 4 divisors (see below), whose sum is σ = 409881664. Its totient is φ = 384264000.

The previous prime is 397072813. The next prime is 397072853. The reversal of 397072831 is 138270793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397072831 - 2¹¹ = 397070783 is a prime.

It is a super-2 number, since 2×397072831² = 315333666236709122, 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 (397072631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6404370 + ... + 6404431.

It is an arithmetic number, because the mean of its divisors is an integer number (102470416).

Almost surely, 2^397072831 is an apocalyptic number.

397072831 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

397072831 is a deficient number, since it is larger than the sum of its proper divisors (12808833).

397072831 is a wasteful number, since it uses less digits than its factorization.

397072831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12808832.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 397072831 is about 19926.6864029121. The cubic root of 397072831 is about 735.0046005234.

The spelling of 397072831 in words is "three hundred ninety-seven million, seventy-two thousand, eight hundred thirty-one".