9722738821 has 8 divisors (see below), whose sum is σ = 10463430744. Its totient is φ = 9000798720.

The previous prime is 9722738791. The next prime is 9722738867. The reversal of 9722738821 is 1288372279.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 222337921 + 9500400900 = 14911^2 + 97470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9722738821 - 2⁵ = 9722738789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9722738321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4686880 + ... + 4688953.

It is an arithmetic number, because the mean of its divisors is an integer number (1307928843).

Almost surely, 2^9722738821 is an apocalyptic number.

It is an amenable number.

9722738821 is a deficient number, since it is larger than the sum of its proper divisors (740691923).

9722738821 is a wasteful number, since it uses less digits than its factorization.

9722738821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9375911.

The product of its digits is 677376, while the sum is 49.

The square root of 9722738821 is about 98603.9493174589. The cubic root of 9722738821 is about 2134.3364102505.

The spelling of 9722738821 in words is "nine billion, seven hundred twenty-two million, seven hundred thirty-eight thousand, eight hundred twenty-one".