397195649 has 2 divisors, whose sum is σ = 397195650. Its totient is φ = 397195648.

The previous prime is 397195619. The next prime is 397195651. The reversal of 397195649 is 946591793.

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., 271195024 + 126000625 = 16468^2 + 11225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397195649 is a prime.

It is a super-3 number, since 3×397195649³ (a number of 27 digits) contains 333 as substring.

Together with 397195651, it forms a pair of twin primes.

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 397195649.

It is not a weakly prime, because it can be changed into another prime (397195619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198597824 + 198597825.

It is an arithmetic number, because the mean of its divisors is an integer number (198597825).

Almost surely, 2^397195649 is an apocalyptic number.

It is an amenable number.

397195649 is a deficient number, since it is larger than the sum of its proper divisors (1).

397195649 is an equidigital number, since it uses as much as digits as its factorization.

397195649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 53.

The square root of 397195649 is about 19929.7679113431. The cubic root of 397195649 is about 735.0803737673.

The spelling of 397195649 in words is "three hundred ninety-seven million, one hundred ninety-five thousand, six hundred forty-nine".