9913986 has 48 divisors (see below), whose sum is σ = 22513920. Its totient is φ = 3149280.

The previous prime is 9913979. The next prime is 9913987. The reversal of 9913986 is 6893199.

It is not an unprimeable number, because it can be changed into a prime (9913987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60741 + ... + 60903.

It is an arithmetic number, because the mean of its divisors is an integer number (469040).

Almost surely, 2^9913986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9913986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11256960).

9913986 is an abundant number, since it is smaller than the sum of its proper divisors (12599934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9913986 is a wasteful number, since it uses less digits than its factorization.

9913986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 308 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 9913986 is about 3148.6482814058. The cubic root of 9913986 is about 214.8239842969.

It can be divided in two parts, 99139 and 86, that added together give a square (99225 = 315²).

The spelling of 9913986 in words is "nine million, nine hundred thirteen thousand, nine hundred eighty-six".