397409713 has 2 divisors, whose sum is σ = 397409714. Its totient is φ = 397409712.

The previous prime is 397409687. The next prime is 397409717. The reversal of 397409713 is 317904793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342546064 + 54863649 = 18508^2 + 7407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397409713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397409713.

It is not a weakly prime, because it can be changed into another prime (397409717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198704856 + 198704857.

It is an arithmetic number, because the mean of its divisors is an integer number (198704857).

Almost surely, 2^397409713 is an apocalyptic number.

It is an amenable number.

397409713 is a deficient number, since it is larger than the sum of its proper divisors (1).

397409713 is an equidigital number, since it uses as much as digits as its factorization.

397409713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142884, while the sum is 43.

The square root of 397409713 is about 19935.1376468787. The cubic root of 397409713 is about 735.2124044058.

The spelling of 397409713 in words is "three hundred ninety-seven million, four hundred nine thousand, seven hundred thirteen".