397409717 has 2 divisors, whose sum is σ = 397409718. Its totient is φ = 397409716.

The previous prime is 397409713. The next prime is 397409743. The reversal of 397409717 is 717904793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286760356 + 110649361 = 16934^2 + 10519^2 .

It is a cyclic number.

It is not a de Polignac number, because 397409717 - 2² = 397409713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397409713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198704858 + 198704859.

It is an arithmetic number, because the mean of its divisors is an integer number (198704859).

Almost surely, 2^397409717 is an apocalyptic number.

It is an amenable number.

397409717 is a deficient number, since it is larger than the sum of its proper divisors (1).

397409717 is an equidigital number, since it uses as much as digits as its factorization.

397409717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 397409717 is about 19935.1377472041. The cubic root of 397409717 is about 735.2124068725.

The spelling of 397409717 in words is "three hundred ninety-seven million, four hundred nine thousand, seven hundred seventeen".