9979789 has 2 divisors, whose sum is σ = 9979790. Its totient is φ = 9979788.

The previous prime is 9979777. The next prime is 9979811. The reversal of 9979789 is 9879799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5442889 + 4536900 = 2333^2 + 2130^2 .

It is a cyclic number.

It is not a de Polignac number, because 9979789 - 2¹¹ = 9977741 is a prime.

9979789 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9979759) 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, 4989894 + 4989895.

It is an arithmetic number, because the mean of its divisors is an integer number (4989895).

Almost surely, 2^9979789 is an apocalyptic number.

It is an amenable number.

9979789 is a deficient number, since it is larger than the sum of its proper divisors (1).

9979789 is an equidigital number, since it uses as much as digits as its factorization.

9979789 is an odious number, because the sum of its binary digits is odd.

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

The square root of 9979789 is about 3159.0804041683. The cubic root of 9979789 is about 215.2982268445.

The spelling of 9979789 in words is "nine million, nine hundred seventy-nine thousand, seven hundred eighty-nine".