390449329 has 2 divisors, whose sum is σ = 390449330. Its totient is φ = 390449328.

The previous prime is 390449327. The next prime is 390449369. The reversal of 390449329 is 923944093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303456400 + 86992929 = 17420^2 + 9327^2 .

It is a cyclic number.

It is not a de Polignac number, because 390449329 - 2¹ = 390449327 is a prime.

Together with 390449327, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (390449327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195224664 + 195224665.

It is an arithmetic number, because the mean of its divisors is an integer number (195224665).

Almost surely, 2^390449329 is an apocalyptic number.

It is an amenable number.

390449329 is a deficient number, since it is larger than the sum of its proper divisors (1).

390449329 is an equidigital number, since it uses as much as digits as its factorization.

390449329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 390449329 is about 19759.7907124544. The cubic root of 390449329 is about 730.8948362299.

The spelling of 390449329 in words is "three hundred ninety million, four hundred forty-nine thousand, three hundred twenty-nine".