9986979 has 4 divisors (see below), whose sum is σ = 13315976. Its totient is φ = 6657984.

The previous prime is 9986941. The next prime is 9986987. The reversal of 9986979 is 9796899.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9986979 - 2⁹ = 9986467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9986479) 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 in 3 ways as a sum of consecutive naturals, for example, 1664494 + ... + 1664499.

It is an arithmetic number, because the mean of its divisors is an integer number (3328994).

Almost surely, 2^9986979 is an apocalyptic number.

9986979 is a deficient number, since it is larger than the sum of its proper divisors (3328997).

9986979 is a wasteful number, since it uses less digits than its factorization.

9986979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328996.

The product of its digits is 2204496, while the sum is 57.

The square root of 9986979 is about 3160.2181886699. The cubic root of 9986979 is about 215.3499187405.

It can be divided in two parts, 99 and 86979, that added together give a palindrome (87078).

The spelling of 9986979 in words is "nine million, nine hundred eighty-six thousand, nine hundred seventy-nine".