9981686 has 32 divisors (see below), whose sum is σ = 18633888. Its totient is φ = 3939840.

The previous prime is 9981661. The next prime is 9981689. The reversal of 9981686 is 6861899.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9981686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981689) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3836 + ... + 5888.

It is an arithmetic number, because the mean of its divisors is an integer number (582309).

Almost surely, 2^9981686 is an apocalyptic number.

9981686 is a deficient number, since it is larger than the sum of its proper divisors (8652202).

9981686 is a wasteful number, since it uses less digits than its factorization.

9981686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096.

The product of its digits is 186624, while the sum is 47.

The square root of 9981686 is about 3159.3806355044. The cubic root of 9981686 is about 215.3118675758.

The spelling of 9981686 in words is "nine million, nine hundred eighty-one thousand, six hundred eighty-six".