9385721 has 2 divisors, whose sum is σ = 9385722. Its totient is φ = 9385720.

The previous prime is 9385711. The next prime is 9385741. The reversal of 9385721 is 1275839.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8620096 + 765625 = 2936^2 + 875^2 .

It is an emirp because it is prime and its reverse (1275839) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9385721 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 (9385711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4692860 + 4692861.

It is an arithmetic number, because the mean of its divisors is an integer number (4692861).

Almost surely, 2^9385721 is an apocalyptic number.

It is an amenable number.

9385721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9385721 is an equidigital number, since it uses as much as digits as its factorization.

9385721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 9385721 is about 3063.6124102112. The cubic root of 9385721 is about 210.9385129645.

The spelling of 9385721 in words is "nine million, three hundred eighty-five thousand, seven hundred twenty-one".