397855793 has 2 divisors, whose sum is σ = 397855794. Its totient is φ = 397855792.

The previous prime is 397855751. The next prime is 397855807. The reversal of 397855793 is 397558793.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305830144 + 92025649 = 17488^2 + 9593^2 .

It is a cyclic number.

It is not a de Polignac number, because 397855793 - 2⁸ = 397855537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397855723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198927896 + 198927897.

It is an arithmetic number, because the mean of its divisors is an integer number (198927897).

Almost surely, 2^397855793 is an apocalyptic number.

It is an amenable number.

397855793 is a deficient number, since it is larger than the sum of its proper divisors (1).

397855793 is an equidigital number, since it uses as much as digits as its factorization.

397855793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7144200, while the sum is 56.

The square root of 397855793 is about 19946.3227939387. The cubic root of 397855793 is about 735.4873858716.

The spelling of 397855793 in words is "three hundred ninety-seven million, eight hundred fifty-five thousand, seven hundred ninety-three".