9986820 has 48 divisors (see below), whose sum is σ = 29611008. Its totient is φ = 2506240.

The previous prime is 9986813. The next prime is 9986831. The reversal of 9986820 is 286899.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3876 + ... + 5915.

It is an arithmetic number, because the mean of its divisors is an integer number (616896).

Almost surely, 2^9986820 is an apocalyptic number.

It is an amenable number.

9986820 is an abundant number, since it is smaller than the sum of its proper divisors (19624188).

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

9986820 is a wasteful number, since it uses less digits than its factorization.

9986820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9820 (or 9818 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 9986820 is about 3160.1930320789. The cubic root of 9986820 is about 215.3487758918.

The spelling of 9986820 in words is "nine million, nine hundred eighty-six thousand, eight hundred twenty".