39720914689 has 2 divisors, whose sum is σ = 39720914690. Its totient is φ = 39720914688.

The previous prime is 39720914669. The next prime is 39720914707. The reversal of 39720914689 is 98641902793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27090526464 + 12630388225 = 164592^2 + 112385^2 .

It is a cyclic number.

It is not a de Polignac number, because 39720914689 - 2²⁹ = 39184043777 is a prime.

It is not a weakly prime, because it can be changed into another prime (39720914609) 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, 19860457344 + 19860457345.

It is an arithmetic number, because the mean of its divisors is an integer number (19860457345).

Almost surely, 2^39720914689 is an apocalyptic number.

It is an amenable number.

39720914689 is a deficient number, since it is larger than the sum of its proper divisors (1).

39720914689 is an equidigital number, since it uses as much as digits as its factorization.

39720914689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 39720914689 in words is "thirty-nine billion, seven hundred twenty million, nine hundred fourteen thousand, six hundred eighty-nine".