397793831 has 2 divisors, whose sum is σ = 397793832. Its totient is φ = 397793830.

The previous prime is 397793821. The next prime is 397793857. The reversal of 397793831 is 138397793.

It is a weak prime.

It is an emirp because it is prime and its reverse (138397793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397793831 is a prime.

It is a super-2 number, since 2×397793831² = 316479863963313122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397793831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397793801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198896915 + 198896916.

It is an arithmetic number, because the mean of its divisors is an integer number (198896916).

Almost surely, 2^397793831 is an apocalyptic number.

397793831 is a deficient number, since it is larger than the sum of its proper divisors (1).

397793831 is an equidigital number, since it uses as much as digits as its factorization.

397793831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The square root of 397793831 is about 19944.7695148377. The cubic root of 397793831 is about 735.4492023252.

The spelling of 397793831 in words is "three hundred ninety-seven million, seven hundred ninety-three thousand, eight hundred thirty-one".