397587317 has 2 divisors, whose sum is σ = 397587318. Its totient is φ = 397587316.

The previous prime is 397587259. The next prime is 397587349. The reversal of 397587317 is 713785793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329458801 + 68128516 = 18151^2 + 8254^2 .

It is a cyclic number.

It is not a de Polignac number, because 397587317 - 2²⁰ = 396538741 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397587367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198793658 + 198793659.

It is an arithmetic number, because the mean of its divisors is an integer number (198793659).

Almost surely, 2^397587317 is an apocalyptic number.

It is an amenable number.

397587317 is a deficient number, since it is larger than the sum of its proper divisors (1).

397587317 is an equidigital number, since it uses as much as digits as its factorization.

397587317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 50.

The square root of 397587317 is about 19939.5916959200. The cubic root of 397587317 is about 735.3219112218.

The spelling of 397587317 in words is "three hundred ninety-seven million, five hundred eighty-seven thousand, three hundred seventeen".