9721433844 has 36 divisors (see below), whose sum is σ = 24791100516. Its totient is φ = 3211799808.

The previous prime is 9721433819. The next prime is 9721433873. The reversal of 9721433844 is 4483341279.

9721433844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 271260900 + 9450172944 = 16470^2 + 97212^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 9721433844.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1190799 + ... + 1198934.

It is an arithmetic number, because the mean of its divisors is an integer number (688641681).

Almost surely, 2^9721433844 is an apocalyptic number.

It is an amenable number.

9721433844 is an abundant number, since it is smaller than the sum of its proper divisors (15069666672).

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

9721433844 is a wasteful number, since it uses less digits than its factorization.

9721433844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389856 (or 2389851 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 9721433844 is about 98597.3318300247. The cubic root of 9721433844 is about 2134.2409164259.

The spelling of 9721433844 in words is "nine billion, seven hundred twenty-one million, four hundred thirty-three thousand, eight hundred forty-four".