397349917 has 2 divisors, whose sum is σ = 397349918. Its totient is φ = 397349916.

The previous prime is 397349903. The next prime is 397349941. The reversal of 397349917 is 719943793.

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., 246207481 + 151142436 = 15691^2 + 12294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397349917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397349317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198674958 + 198674959.

It is an arithmetic number, because the mean of its divisors is an integer number (198674959).

Almost surely, 2^397349917 is an apocalyptic number.

It is an amenable number.

397349917 is a deficient number, since it is larger than the sum of its proper divisors (1).

397349917 is an equidigital number, since it uses as much as digits as its factorization.

397349917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1285956, while the sum is 52.

The square root of 397349917 is about 19933.6378265484. The cubic root of 397349917 is about 735.1755281338.

The spelling of 397349917 in words is "three hundred ninety-seven million, three hundred forty-nine thousand, nine hundred seventeen".