398697317 has 2 divisors, whose sum is σ = 398697318. Its totient is φ = 398697316.

The previous prime is 398697289. The next prime is 398697319. The reversal of 398697317 is 713796893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342657121 + 56040196 = 18511^2 + 7486^2 .

It is a cyclic number.

It is not a de Polignac number, because 398697317 - 2⁶ = 398697253 is a prime.

Together with 398697319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398697319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199348658 + 199348659.

It is an arithmetic number, because the mean of its divisors is an integer number (199348659).

Almost surely, 2^398697317 is an apocalyptic number.

It is an amenable number.

398697317 is a deficient number, since it is larger than the sum of its proper divisors (1).

398697317 is an equidigital number, since it uses as much as digits as its factorization.

398697317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 398697317 is about 19967.4063663762. The cubic root of 398697317 is about 736.0055756558.

The spelling of 398697317 in words is "three hundred ninety-eight million, six hundred ninety-seven thousand, three hundred seventeen".