390940283857 has 2 divisors, whose sum is σ = 390940283858. Its totient is φ = 390940283856.

The previous prime is 390940283849. The next prime is 390940283917. The reversal of 390940283857 is 758382049093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348006786241 + 42933497616 = 589921^2 + 207204^2 .

It is a cyclic number.

It is not a de Polignac number, because 390940283857 - 2³ = 390940283849 is a prime.

It is not a weakly prime, because it can be changed into another prime (390940283837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195470141928 + 195470141929.

It is an arithmetic number, because the mean of its divisors is an integer number (195470141929).

Almost surely, 2^390940283857 is an apocalyptic number.

It is an amenable number.

390940283857 is a deficient number, since it is larger than the sum of its proper divisors (1).

390940283857 is an equidigital number, since it uses as much as digits as its factorization.

390940283857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 390940283857 in words is "three hundred ninety billion, nine hundred forty million, two hundred eighty-three thousand, eight hundred fifty-seven".