397189697 has 2 divisors, whose sum is σ = 397189698. Its totient is φ = 397189696.

The previous prime is 397189687. The next prime is 397189759. The reversal of 397189697 is 796981793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378535936 + 18653761 = 19456^2 + 4319^2 .

It is an emirp because it is prime and its reverse (796981793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397189697 - 2⁶ = 397189633 is a prime.

It is not a weakly prime, because it can be changed into another prime (397189687) 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, 198594848 + 198594849.

It is an arithmetic number, because the mean of its divisors is an integer number (198594849).

Almost surely, 2^397189697 is an apocalyptic number.

It is an amenable number.

397189697 is a deficient number, since it is larger than the sum of its proper divisors (1).

397189697 is an equidigital number, since it uses as much as digits as its factorization.

397189697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 59.

The square root of 397189697 is about 19929.6185864155. The cubic root of 397189697 is about 735.0767020082.

The spelling of 397189697 in words is "three hundred ninety-seven million, one hundred eighty-nine thousand, six hundred ninety-seven".