9989729 has 2 divisors, whose sum is σ = 9989730. Its totient is φ = 9989728.

The previous prime is 9989723. The next prime is 9989737. The reversal of 9989729 is 9279899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9778129 + 211600 = 3127^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 9989729 - 2⁴ = 9989713 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9989723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994864 + 4994865.

It is an arithmetic number, because the mean of its divisors is an integer number (4994865).

Almost surely, 2^9989729 is an apocalyptic number.

It is an amenable number.

9989729 is a deficient number, since it is larger than the sum of its proper divisors (1).

9989729 is an equidigital number, since it uses as much as digits as its factorization.

9989729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The square root of 9989729 is about 3160.6532552623. The cubic root of 9989729 is about 215.3696830732.

The spelling of 9989729 in words is "nine million, nine hundred eighty-nine thousand, seven hundred twenty-nine".