7686939989 has 2 divisors, whose sum is σ = 7686939990. Its totient is φ = 7686939988.

The previous prime is 7686939971. The next prime is 7686940003. The reversal of 7686939989 is 9899396867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3960814225 + 3726125764 = 62935^2 + 61042^2 .

It is an emirp because it is prime and its reverse (9899396867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7686939989 - 2³² = 3391972693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7686939389) 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, 3843469994 + 3843469995.

It is an arithmetic number, because the mean of its divisors is an integer number (3843469995).

Almost surely, 2^7686939989 is an apocalyptic number.

It is an amenable number.

7686939989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7686939989 is an equidigital number, since it uses as much as digits as its factorization.

7686939989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317447424, while the sum is 74.

The square root of 7686939989 is about 87675.1959735477. The cubic root of 7686939989 is about 1973.5637682080.

The spelling of 7686939989 in words is "seven billion, six hundred eighty-six million, nine hundred thirty-nine thousand, nine hundred eighty-nine".