9986640 has 40 divisors (see below), whose sum is σ = 30959328. Its totient is φ = 2663040.

The previous prime is 9986611. The next prime is 9986651. The reversal of 9986640 is 466899.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9986592 and 9986601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20566 + ... + 21045.

Almost surely, 2^9986640 is an apocalyptic number.

It is an amenable number.

9986640 is an abundant number, since it is smaller than the sum of its proper divisors (20972688).

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

9986640 is a wasteful number, since it uses less digits than its factorization.

9986640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41627 (or 41621 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 9986640 is about 3160.1645526776. The cubic root of 9986640 is about 215.3474820861.

The spelling of 9986640 in words is "nine million, nine hundred eighty-six thousand, six hundred forty".