397197841 has 2 divisors, whose sum is σ = 397197842. Its totient is φ = 397197840.

The previous prime is 397197743. The next prime is 397197881. The reversal of 397197841 is 148791793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377136400 + 20061441 = 19420^2 + 4479^2 .

It is a cyclic number.

It is not a de Polignac number, because 397197841 - 2¹¹ = 397195793 is a prime.

It is a super-2 number, since 2×397197841² = 315532249790122562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (397197881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198598920 + 198598921.

It is an arithmetic number, because the mean of its divisors is an integer number (198598921).

Almost surely, 2^397197841 is an apocalyptic number.

It is an amenable number.

397197841 is a deficient number, since it is larger than the sum of its proper divisors (1).

397197841 is an equidigital number, since it uses as much as digits as its factorization.

397197841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 49.

The square root of 397197841 is about 19929.8229043813. The cubic root of 397197841 is about 735.0817259919.

The spelling of 397197841 in words is "three hundred ninety-seven million, one hundred ninety-seven thousand, eight hundred forty-one".