396717851 has 2 divisors, whose sum is σ = 396717852. Its totient is φ = 396717850.

The previous prime is 396717821. The next prime is 396717857. The reversal of 396717851 is 158717693.

It is a strong prime.

It is an emirp because it is prime and its reverse (158717693) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396717851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 396717796 and 396717805.

It is not a weakly prime, because it can be changed into another prime (396717857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198358925 + 198358926.

It is an arithmetic number, because the mean of its divisors is an integer number (198358926).

Almost surely, 2^396717851 is an apocalyptic number.

396717851 is a deficient number, since it is larger than the sum of its proper divisors (1).

396717851 is an equidigital number, since it uses as much as digits as its factorization.

396717851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 47.

The square root of 396717851 is about 19917.7772605278. Note that the first 3 decimals coincide. The cubic root of 396717851 is about 734.7855057693.

The spelling of 396717851 in words is "three hundred ninety-six million, seven hundred seventeen thousand, eight hundred fifty-one".