9720839 has 2 divisors, whose sum is σ = 9720840. Its totient is φ = 9720838.

The previous prime is 9720833. The next prime is 9720857. The reversal of 9720839 is 9380279.

9720839 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9720839 - 2²⁰ = 8672263 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9720833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860419 + 4860420.

It is an arithmetic number, because the mean of its divisors is an integer number (4860420).

Almost surely, 2^9720839 is an apocalyptic number.

9720839 is a deficient number, since it is larger than the sum of its proper divisors (1).

9720839 is an equidigital number, since it uses as much as digits as its factorization.

9720839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 9720839 is about 3117.8260054083. The cubic root of 9720839 is about 213.4197384909.

The spelling of 9720839 in words is "nine million, seven hundred twenty thousand, eight hundred thirty-nine".