9920689 has 2 divisors, whose sum is σ = 9920690. Its totient is φ = 9920688.

The previous prime is 9920683. The next prime is 9920711. The reversal of 9920689 is 9860299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6051600 + 3869089 = 2460^2 + 1967^2 .

It is an emirp because it is prime and its reverse (9860299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9920689 - 2⁵ = 9920657 is a prime.

9920689 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9920683) 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, 4960344 + 4960345.

It is an arithmetic number, because the mean of its divisors is an integer number (4960345).

Almost surely, 2^9920689 is an apocalyptic number.

It is an amenable number.

9920689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920689 is an equidigital number, since it uses as much as digits as its factorization.

9920689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 9920689 is about 3149.7125265649. The cubic root of 9920689 is about 214.8723886676.

It can be divided in two parts, 9920 and 689, that added together give a square (10609 = 103²).

The spelling of 9920689 in words is "nine million, nine hundred twenty thousand, six hundred eighty-nine".