397645393 has 2 divisors, whose sum is σ = 397645394. Its totient is φ = 397645392.

The previous prime is 397645387. The next prime is 397645403. The reversal of 397645393 is 393546793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388208209 + 9437184 = 19703^2 + 3072^2 .

It is a cyclic number.

It is not a de Polignac number, because 397645393 - 2⁹ = 397644881 is a prime.

It is not a weakly prime, because it can be changed into another prime (397645693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198822696 + 198822697.

It is an arithmetic number, because the mean of its divisors is an integer number (198822697).

Almost surely, 2^397645393 is an apocalyptic number.

It is an amenable number.

397645393 is a deficient number, since it is larger than the sum of its proper divisors (1).

397645393 is an equidigital number, since it uses as much as digits as its factorization.

397645393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 49.

The square root of 397645393 is about 19941.0479413696. The cubic root of 397645393 is about 735.3577125619.

The spelling of 397645393 in words is "three hundred ninety-seven million, six hundred forty-five thousand, three hundred ninety-three".