397376493817 has 2 divisors, whose sum is σ = 397376493818. Its totient is φ = 397376493816.

The previous prime is 397376493809. The next prime is 397376493847. The reversal of 397376493817 is 718394673793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310899917056 + 86476576761 = 557584^2 + 294069^2 .

It is an emirp because it is prime and its reverse (718394673793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397376493817 - 2³ = 397376493809 is a prime.

It is not a weakly prime, because it can be changed into another prime (397376493847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198688246908 + 198688246909.

It is an arithmetic number, because the mean of its divisors is an integer number (198688246909).

Almost surely, 2^397376493817 is an apocalyptic number.

It is an amenable number.

397376493817 is a deficient number, since it is larger than the sum of its proper divisors (1).

397376493817 is an equidigital number, since it uses as much as digits as its factorization.

397376493817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144027072, while the sum is 67.

The spelling of 397376493817 in words is "three hundred ninety-seven billion, three hundred seventy-six million, four hundred ninety-three thousand, eight hundred seventeen".