9981824 has 16 divisors (see below), whose sum is σ = 19885920. Its totient is φ = 4990848.

The previous prime is 9981809. The next prime is 9981847. The reversal of 9981824 is 4281899.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38864 + ... + 39119.

It is an arithmetic number, because the mean of its divisors is an integer number (1242870).

Almost surely, 2^9981824 is an apocalyptic number.

It is an amenable number.

9981824 is a deficient number, since it is larger than the sum of its proper divisors (9904096).

9981824 is an equidigital number, since it uses as much as digits as its factorization.

9981824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77997 (or 77985 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 9981824 is about 3159.4024751525. The cubic root of 9981824 is about 215.3128598230.

The spelling of 9981824 in words is "nine million, nine hundred eighty-one thousand, eight hundred twenty-four".