396717857 has 2 divisors, whose sum is σ = 396717858. Its totient is φ = 396717856.

The previous prime is 396717851. The next prime is 396717877. The reversal of 396717857 is 758717693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241989136 + 154728721 = 15556^2 + 12439^2 .

It is an emirp because it is prime and its reverse (758717693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 396717857 - 2¹⁰ = 396716833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 396717799 and 396717808.

It is not a weakly prime, because it can be changed into another prime (396717851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198358928 + 198358929.

It is an arithmetic number, because the mean of its divisors is an integer number (198358929).

Almost surely, 2^396717857 is an apocalyptic number.

It is an amenable number.

396717857 is a deficient number, since it is larger than the sum of its proper divisors (1).

396717857 is an equidigital number, since it uses as much as digits as its factorization.

396717857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222640, while the sum is 53.

The square root of 396717857 is about 19917.7774111471. Note that the first 3 decimals coincide. The cubic root of 396717857 is about 734.7855094737.

The spelling of 396717857 in words is "three hundred ninety-six million, seven hundred seventeen thousand, eight hundred fifty-seven".