390965389 has 2 divisors, whose sum is σ = 390965390. Its totient is φ = 390965388.

The previous prime is 390965359. The next prime is 390965401. The reversal of 390965389 is 983569093.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322489764 + 68475625 = 17958^2 + 8275^2 .

It is a cyclic number.

It is not a de Polignac number, because 390965389 - 2⁵ = 390965357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390965359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195482694 + 195482695.

It is an arithmetic number, because the mean of its divisors is an integer number (195482695).

Almost surely, 2^390965389 is an apocalyptic number.

It is an amenable number.

390965389 is a deficient number, since it is larger than the sum of its proper divisors (1).

390965389 is an equidigital number, since it uses as much as digits as its factorization.

390965389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 390965389 is about 19772.8447371641. The cubic root of 390965389 is about 731.2167043159.

The spelling of 390965389 in words is "three hundred ninety million, nine hundred sixty-five thousand, three hundred eighty-nine".