329520397 has 2 divisors, whose sum is σ = 329520398. Its totient is φ = 329520396.

The previous prime is 329520377. The next prime is 329520419. The reversal of 329520397 is 793025923.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311381316 + 18139081 = 17646^2 + 4259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-329520397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (329520377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164760198 + 164760199.

It is an arithmetic number, because the mean of its divisors is an integer number (164760199).

Almost surely, 2^329520397 is an apocalyptic number.

It is an amenable number.

329520397 is a deficient number, since it is larger than the sum of its proper divisors (1).

329520397 is an equidigital number, since it uses as much as digits as its factorization.

329520397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 329520397 is about 18152.6966867185. The cubic root of 329520397 is about 690.7073869814.

The spelling of 329520397 in words is "three hundred twenty-nine million, five hundred twenty thousand, three hundred ninety-seven".