9986818 has 16 divisors (see below), whose sum is σ = 16197120. Its totient is φ = 4602096.

The previous prime is 9986813. The next prime is 9986831. The reversal of 9986818 is 8186899.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9986813) 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, 2146 + ... + 4957.

It is an arithmetic number, because the mean of its divisors is an integer number (1012320).

Almost surely, 2^9986818 is an apocalyptic number.

9986818 is a deficient number, since it is larger than the sum of its proper divisors (6210302).

9986818 is a wasteful number, since it uses less digits than its factorization.

9986818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161.

The product of its digits is 248832, while the sum is 49.

The square root of 9986818 is about 3160.1927156425. The cubic root of 9986818 is about 215.3487615162.

The spelling of 9986818 in words is "nine million, nine hundred eighty-six thousand, eight hundred eighteen".