39719679997 has 2 divisors, whose sum is σ = 39719679998. Its totient is φ = 39719679996.

The previous prime is 39719679991. The next prime is 39719680057. The reversal of 39719679997 is 79997691793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20890077156 + 18829602841 = 144534^2 + 137221^2 .

It is a cyclic number.

It is not a de Polignac number, because 39719679997 - 2²⁷ = 39585462269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39719679991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19859839998 + 19859839999.

It is an arithmetic number, because the mean of its divisors is an integer number (19859839999).

Almost surely, 2^39719679997 is an apocalyptic number.

It is an amenable number.

39719679997 is a deficient number, since it is larger than the sum of its proper divisors (1).

39719679997 is an equidigital number, since it uses as much as digits as its factorization.

39719679997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364568526, while the sum is 76.

The spelling of 39719679997 in words is "thirty-nine billion, seven hundred nineteen million, six hundred seventy-nine thousand, nine hundred ninety-seven".