9989779 has 2 divisors, whose sum is σ = 9989780. Its totient is φ = 9989778.

The previous prime is 9989747. The next prime is 9989807. The reversal of 9989779 is 9779899.

9989779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9989779 - 2⁵ = 9989747 is a prime.

It is not a weakly prime, because it can be changed into another prime (9989729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994889 + 4994890.

It is an arithmetic number, because the mean of its divisors is an integer number (4994890).

Almost surely, 2^9989779 is an apocalyptic number.

9989779 is a deficient number, since it is larger than the sum of its proper divisors (1).

9989779 is an equidigital number, since it uses as much as digits as its factorization.

9989779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 58.

The square root of 9989779 is about 3160.6611650096. The cubic root of 9989779 is about 215.3700423912.

The spelling of 9989779 in words is "nine million, nine hundred eighty-nine thousand, seven hundred seventy-nine".