9929820 has 48 divisors (see below), whose sum is σ = 27998208. Its totient is φ = 2629440.

The previous prime is 9929771. The next prime is 9929833. The reversal of 9929820 is 289299.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 9525 + ... + 10515.

It is an arithmetic number, because the mean of its divisors is an integer number (583296).

Almost surely, 2^9929820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9929820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13999104).

9929820 is an abundant number, since it is smaller than the sum of its proper divisors (18068388).

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

9929820 is a wasteful number, since it uses less digits than its factorization.

9929820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 9929820 is about 3151.1616905516. The cubic root of 9929820 is about 214.9382912861.

The spelling of 9929820 in words is "nine million, nine hundred twenty-nine thousand, eight hundred twenty".