9989866 has 16 divisors (see below), whose sum is σ = 15840000. Its totient is φ = 4715568.

The previous prime is 9989849. The next prime is 9989879. The reversal of 9989866 is 6689899.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2260 + ... + 5008.

It is an arithmetic number, because the mean of its divisors is an integer number (990000).

Almost surely, 2^9989866 is an apocalyptic number.

9989866 is a deficient number, since it is larger than the sum of its proper divisors (5850134).

9989866 is a wasteful number, since it uses less digits than its factorization.

9989866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853.

The product of its digits is 1679616, while the sum is 55.

The square root of 9989866 is about 3160.6749279228. The cubic root of 9989866 is about 215.3706676015.

The spelling of 9989866 in words is "nine million, nine hundred eighty-nine thousand, eight hundred sixty-six".