9728861 has 2 divisors, whose sum is σ = 9728862. Its totient is φ = 9728860.

The previous prime is 9728843. The next prime is 9728867. The reversal of 9728861 is 1688279.

9728861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9572836 + 156025 = 3094^2 + 395^2 .

It is an emirp because it is prime and its reverse (1688279) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9728861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9728867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4864430 + 4864431.

It is an arithmetic number, because the mean of its divisors is an integer number (4864431).

Almost surely, 2^9728861 is an apocalyptic number.

It is an amenable number.

9728861 is a deficient number, since it is larger than the sum of its proper divisors (1).

9728861 is an equidigital number, since it uses as much as digits as its factorization.

9728861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 9728861 is about 3119.1122134351. The cubic root of 9728861 is about 213.4784296665.

The spelling of 9728861 in words is "nine million, seven hundred twenty-eight thousand, eight hundred sixty-one".