9978986 has 16 divisors (see below), whose sum is σ = 15234048. Its totient is φ = 4902000.

The previous prime is 9978961. The next prime is 9978989. The reversal of 9978986 is 6898799.

It is not an unprimeable number, because it can be changed into a prime (9978989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52151 + ... + 52341.

It is an arithmetic number, because the mean of its divisors is an integer number (952128).

Almost surely, 2^9978986 is an apocalyptic number.

9978986 is a deficient number, since it is larger than the sum of its proper divisors (5255062).

9978986 is a wasteful number, since it uses less digits than its factorization.

9978986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517.

The product of its digits is 1959552, while the sum is 56.

The square root of 9978986 is about 3158.9533076638. The cubic root of 9978986 is about 215.2924522029.

The spelling of 9978986 in words is "nine million, nine hundred seventy-eight thousand, nine hundred eighty-six".