8988821 has 2 divisors, whose sum is σ = 8988822. Its totient is φ = 8988820.

The previous prime is 8988809. The next prime is 8988829. The reversal of 8988821 is 1288898.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5340721 + 3648100 = 2311^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 8988821 - 2⁶ = 8988757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8988829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4494410 + 4494411.

It is an arithmetic number, because the mean of its divisors is an integer number (4494411).

Almost surely, 2^8988821 is an apocalyptic number.

It is an amenable number.

8988821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8988821 is an equidigital number, since it uses as much as digits as its factorization.

8988821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 44.

The square root of 8988821 is about 2998.1362544087. The cubic root of 8988821 is about 207.9222234481.

The spelling of 8988821 in words is "eight million, nine hundred eighty-eight thousand, eight hundred twenty-one".