9821938742 has 64 divisors (see below), whose sum is σ = 18761932800. Its totient is φ = 3745301280.

The previous prime is 9821938741. The next prime is 9821938769. The reversal of 9821938742 is 2478391289.

9821938742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9821938741) 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 31 ways as a sum of consecutive naturals, for example, 2169293 + ... + 2173815.

It is an arithmetic number, because the mean of its divisors is an integer number (293155200).

Almost surely, 2^9821938742 is an apocalyptic number.

9821938742 is a deficient number, since it is larger than the sum of its proper divisors (8939994058).

9821938742 is a wasteful number, since it uses less digits than its factorization.

9821938742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4841.

The product of its digits is 1741824, while the sum is 53.

The square root of 9821938742 is about 99105.6948010557. The cubic root of 9821938742 is about 2141.5706539350.

The spelling of 9821938742 in words is "nine billion, eight hundred twenty-one million, nine hundred thirty-eight thousand, seven hundred forty-two".