397838713 has 2 divisors, whose sum is σ = 397838714. Its totient is φ = 397838712.

The previous prime is 397838687. The next prime is 397838729. The reversal of 397838713 is 317838793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289408144 + 108430569 = 17012^2 + 10413^2 .

It is a cyclic number.

It is not a de Polignac number, because 397838713 - 2⁵ = 397838681 is a prime.

It is a super-2 number, since 2×397838713² = 316551283122992738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (397838113) 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 as a sum of consecutive naturals, namely, 198919356 + 198919357.

It is an arithmetic number, because the mean of its divisors is an integer number (198919357).

Almost surely, 2^397838713 is an apocalyptic number.

It is an amenable number.

397838713 is a deficient number, since it is larger than the sum of its proper divisors (1).

397838713 is an equidigital number, since it uses as much as digits as its factorization.

397838713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 397838713 is about 19945.8946402512. The cubic root of 397838713 is about 735.4768608652.

The spelling of 397838713 in words is "three hundred ninety-seven million, eight hundred thirty-eight thousand, seven hundred thirteen".