397130917 has 2 divisors, whose sum is σ = 397130918. Its totient is φ = 397130916.

The previous prime is 397130911. The next prime is 397130933. The reversal of 397130917 is 719031793.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328008321 + 69122596 = 18111^2 + 8314^2 .

It is an emirp because it is prime and its reverse (719031793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397130917 is a prime.

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 397130917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397130911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198565458 + 198565459.

It is an arithmetic number, because the mean of its divisors is an integer number (198565459).

Almost surely, 2^397130917 is an apocalyptic number.

It is an amenable number.

397130917 is a deficient number, since it is larger than the sum of its proper divisors (1).

397130917 is an equidigital number, since it uses as much as digits as its factorization.

397130917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35721, while the sum is 40.

The square root of 397130917 is about 19928.1438423151. The cubic root of 397130917 is about 735.0404389493.

The spelling of 397130917 in words is "three hundred ninety-seven million, one hundred thirty thousand, nine hundred seventeen".