39980686393 has 2 divisors, whose sum is σ = 39980686394. Its totient is φ = 39980686392.

The previous prime is 39980686387. The next prime is 39980686409. The reversal of 39980686393 is 39368608993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32361491449 + 7619194944 = 179893^2 + 87288^2 .

It is a cyclic number.

It is not a de Polignac number, because 39980686393 - 2⁹ = 39980685881 is a prime.

It is not a weakly prime, because it can be changed into another prime (39980686313) 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, 19990343196 + 19990343197.

It is an arithmetic number, because the mean of its divisors is an integer number (19990343197).

Almost surely, 2^39980686393 is an apocalyptic number.

It is an amenable number.

39980686393 is a deficient number, since it is larger than the sum of its proper divisors (1).

39980686393 is an equidigital number, since it uses as much as digits as its factorization.

39980686393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45349632, while the sum is 64.

The spelling of 39980686393 in words is "thirty-nine billion, nine hundred eighty million, six hundred eighty-six thousand, three hundred ninety-three".