9443789721 has 12 divisors (see below), whose sum is σ = 13661307348. Its totient is φ = 6286500864.

The previous prime is 9443789689. The next prime is 9443789741. The reversal of 9443789721 is 1279873449.

9443789721 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 3497066496 + 5946723225 = 59136^2 + 77115^2 .

It is not a de Polignac number, because 9443789721 - 2⁵ = 9443789689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9443789741) by changing a digit.

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, 773520 + ... + 785633.

It is an arithmetic number, because the mean of its divisors is an integer number (1138442279).

Almost surely, 2^9443789721 is an apocalyptic number.

It is an amenable number.

9443789721 is a deficient number, since it is larger than the sum of its proper divisors (4217517627).

9443789721 is a wasteful number, since it uses less digits than its factorization.

9443789721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559832 (or 1559829 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 9443789721 is about 97179.1629980419. The cubic root of 9443789721 is about 2113.7263891218.

The spelling of 9443789721 in words is "nine billion, four hundred forty-three million, seven hundred eighty-nine thousand, seven hundred twenty-one".