8373539921 has 18 divisors (see below), whose sum is σ = 8882668998. Its totient is φ = 7888632000.

The previous prime is 8373539897. The next prime is 8373539929. The reversal of 8373539921 is 1299353738.

8373539921 is digitally balanced in base 3, 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 3 ways, for example, as 44422225 + 8329117696 = 6665^2 + 91264^2 .

It is not a de Polignac number, because 8373539921 - 2⁶ = 8373539857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8373539921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8373539929) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18163631 + ... + 18164091.

It is an arithmetic number, because the mean of its divisors is an integer number (493481611).

Almost surely, 2^8373539921 is an apocalyptic number.

It is an amenable number.

8373539921 is a deficient number, since it is larger than the sum of its proper divisors (509129077).

8373539921 is an frugal number, since it uses more digits than its factorization.

8373539921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 533 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 50.

The square root of 8373539921 is about 91507.0484771528. The cubic root of 8373539921 is about 2030.6560298101.

The spelling of 8373539921 in words is "eight billion, three hundred seventy-three million, five hundred thirty-nine thousand, nine hundred twenty-one".