8823721 has 4 divisors (see below), whose sum is σ = 8845200. Its totient is φ = 8802244.

The previous prime is 8823719. The next prime is 8823751. The reversal of 8823721 is 1273288.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8823721 - 2¹ = 8823719 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8823751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10111 + ... + 10948.

It is an arithmetic number, because the mean of its divisors is an integer number (2211300).

Almost surely, 2^8823721 is an apocalyptic number.

It is an amenable number.

8823721 is a deficient number, since it is larger than the sum of its proper divisors (21479).

8823721 is a wasteful number, since it uses less digits than its factorization.

8823721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21478.

The product of its digits is 5376, while the sum is 31.

The square root of 8823721 is about 2970.4748778604. The cubic root of 8823721 is about 206.6413620885.

The spelling of 8823721 in words is "eight million, eight hundred twenty-three thousand, seven hundred twenty-one".