397031329 has 2 divisors, whose sum is σ = 397031330. Its totient is φ = 397031328.

The previous prime is 397031309. The next prime is 397031339. The reversal of 397031329 is 923130793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335878929 + 61152400 = 18327^2 + 7820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397031329 is a prime.

It is not a weakly prime, because it can be changed into another prime (397031309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198515664 + 198515665.

It is an arithmetic number, because the mean of its divisors is an integer number (198515665).

Almost surely, 2^397031329 is an apocalyptic number.

It is an amenable number.

397031329 is a deficient number, since it is larger than the sum of its proper divisors (1).

397031329 is an equidigital number, since it uses as much as digits as its factorization.

397031329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 397031329 is about 19925.6450083805. The cubic root of 397031329 is about 734.9789921032.

The spelling of 397031329 in words is "three hundred ninety-seven million, thirty-one thousand, three hundred twenty-nine".