390649717 has 2 divisors, whose sum is σ = 390649718. Its totient is φ = 390649716.

The previous prime is 390649669. The next prime is 390649723. The reversal of 390649717 is 717946093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244578321 + 146071396 = 15639^2 + 12086^2 .

It is a cyclic number.

It is not a de Polignac number, because 390649717 - 2¹¹ = 390647669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390649757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195324858 + 195324859.

It is an arithmetic number, because the mean of its divisors is an integer number (195324859).

Almost surely, 2^390649717 is an apocalyptic number.

It is an amenable number.

390649717 is a deficient number, since it is larger than the sum of its proper divisors (1).

390649717 is an equidigital number, since it uses as much as digits as its factorization.

390649717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 390649717 is about 19764.8606622966. The cubic root of 390649717 is about 731.0198524566.

The spelling of 390649717 in words is "three hundred ninety million, six hundred forty-nine thousand, seven hundred seventeen".