9979820 has 24 divisors (see below), whose sum is σ = 21058800. Its totient is φ = 3972672.

The previous prime is 9979819. The next prime is 9979843. The reversal of 9979820 is 289799.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3491 + ... + 5669.

It is an arithmetic number, because the mean of its divisors is an integer number (877450).

Almost surely, 2^9979820 is an apocalyptic number.

It is an amenable number.

9979820 is an abundant number, since it is smaller than the sum of its proper divisors (11078980).

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

9979820 is a wasteful number, since it uses less digits than its factorization.

9979820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417 (or 2415 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 9979820 is about 3159.0853106556. The cubic root of 9979820 is about 215.2984497696.

The spelling of 9979820 in words is "nine million, nine hundred seventy-nine thousand, eight hundred twenty".