397911329 has 2 divisors, whose sum is σ = 397911330. Its totient is φ = 397911328.

The previous prime is 397911323. The next prime is 397911341. The reversal of 397911329 is 923119793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208022929 + 189888400 = 14423^2 + 13780^2 .

It is a cyclic number.

It is not a de Polignac number, because 397911329 - 2⁴ = 397911313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397911329.

It is not a weakly prime, because it can be changed into another prime (397911323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198955664 + 198955665.

It is an arithmetic number, because the mean of its divisors is an integer number (198955665).

Almost surely, 2^397911329 is an apocalyptic number.

It is an amenable number.

397911329 is a deficient number, since it is larger than the sum of its proper divisors (1).

397911329 is an equidigital number, since it uses as much as digits as its factorization.

397911329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 44.

The square root of 397911329 is about 19947.7148816600. The cubic root of 397911329 is about 735.5216060822.

The spelling of 397911329 in words is "three hundred ninety-seven million, nine hundred eleven thousand, three hundred twenty-nine".