9804721 has 2 divisors, whose sum is σ = 9804722. Its totient is φ = 9804720.

The previous prime is 9804689. The next prime is 9804727. The reversal of 9804721 is 1274089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7952400 + 1852321 = 2820^2 + 1361^2 .

It is an emirp because it is prime and its reverse (1274089) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9804721 - 2⁵ = 9804689 is a prime.

It is a super-2 number, since 2×9804721² = 192265107775682, which contains 22 as substring.

It is a Chen prime.

9804721 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9804727) 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, 4902360 + 4902361.

It is an arithmetic number, because the mean of its divisors is an integer number (4902361).

Almost surely, 2^9804721 is an apocalyptic number.

It is an amenable number.

9804721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9804721 is an equidigital number, since it uses as much as digits as its factorization.

9804721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 9804721 is about 3131.2491117763. The cubic root of 9804721 is about 214.0318539359.

The spelling of 9804721 in words is "nine million, eight hundred four thousand, seven hundred twenty-one".