8809821 has 24 divisors (see below), whose sum is σ = 13253760. Its totient is φ = 5634816.

The previous prime is 8809817. The next prime is 8809837. The reversal of 8809821 is 1289088.

8809821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8809821 - 2² = 8809817 is a prime.

It is a super-2 number, since 2×8809821² = 155225892104082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8809841) 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 23 ways as a sum of consecutive naturals, for example, 24781 + ... + 25133.

It is an arithmetic number, because the mean of its divisors is an integer number (552240).

Almost surely, 2^8809821 is an apocalyptic number.

It is an amenable number.

8809821 is a deficient number, since it is larger than the sum of its proper divisors (4443939).

8809821 is a wasteful number, since it uses less digits than its factorization.

8809821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 8809821 is about 2968.1342624619. The cubic root of 8809821 is about 206.5327977423.

It can be divided in two parts, 880 and 9821, that added together give a palindrome (10701).

The spelling of 8809821 in words is "eight million, eight hundred nine thousand, eight hundred twenty-one".