9939866723 has 2 divisors, whose sum is σ = 9939866724. Its totient is φ = 9939866722.

The previous prime is 9939866711. The next prime is 9939866747. The reversal of 9939866723 is 3276689399.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9939866723 - 2⁶ = 9939866659 is a prime.

It is not a weakly prime, because it can be changed into another prime (9939868723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969933361 + 4969933362.

It is an arithmetic number, because the mean of its divisors is an integer number (4969933362).

Almost surely, 2^9939866723 is an apocalyptic number.

9939866723 is a deficient number, since it is larger than the sum of its proper divisors (1).

9939866723 is an equidigital number, since it uses as much as digits as its factorization.

9939866723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 62.

The square root of 9939866723 is about 99698.8802494792. The cubic root of 9939866723 is about 2150.1075643318.

The spelling of 9939866723 in words is "nine billion, nine hundred thirty-nine million, eight hundred sixty-six thousand, seven hundred twenty-three".