393961440589 has 2 divisors, whose sum is σ = 393961440590. Its totient is φ = 393961440588.

The previous prime is 393961440553. The next prime is 393961440659. The reversal of 393961440589 is 985044169393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378368923689 + 15592516900 = 615117^2 + 124870^2 .

It is a cyclic number.

It is not a de Polignac number, because 393961440589 - 2⁹ = 393961440077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393961440689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196980720294 + 196980720295.

It is an arithmetic number, because the mean of its divisors is an integer number (196980720295).

Almost surely, 2^393961440589 is an apocalyptic number.

It is an amenable number.

393961440589 is a deficient number, since it is larger than the sum of its proper divisors (1).

393961440589 is an equidigital number, since it uses as much as digits as its factorization.

393961440589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25194240, while the sum is 61.

The spelling of 393961440589 in words is "three hundred ninety-three billion, nine hundred sixty-one million, four hundred forty thousand, five hundred eighty-nine".