397179649 has 2 divisors, whose sum is σ = 397179650. Its totient is φ = 397179648.

The previous prime is 397179647. The next prime is 397179767. The reversal of 397179649 is 946971793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392634225 + 4545424 = 19815^2 + 2132^2 .

It is a cyclic number.

It is not a de Polignac number, because 397179649 - 2¹ = 397179647 is a prime.

Together with 397179647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 397179649.

It is not a weakly prime, because it can be changed into another prime (397179647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198589824 + 198589825.

It is an arithmetic number, because the mean of its divisors is an integer number (198589825).

Almost surely, 2^397179649 is an apocalyptic number.

It is an amenable number.

397179649 is a deficient number, since it is larger than the sum of its proper divisors (1).

397179649 is an equidigital number, since it uses as much as digits as its factorization.

397179649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 55.

The square root of 397179649 is about 19929.3664977089. The cubic root of 397179649 is about 735.0705033638.

The spelling of 397179649 in words is "three hundred ninety-seven million, one hundred seventy-nine thousand, six hundred forty-nine".