8784221 has 2 divisors, whose sum is σ = 8784222. Its totient is φ = 8784220.

The previous prime is 8784203. The next prime is 8784227. The reversal of 8784221 is 1224878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7812025 + 972196 = 2795^2 + 986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8784221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8784227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4392110 + 4392111.

It is an arithmetic number, because the mean of its divisors is an integer number (4392111).

Almost surely, 2^8784221 is an apocalyptic number.

It is an amenable number.

8784221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8784221 is an equidigital number, since it uses as much as digits as its factorization.

8784221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 32.

The square root of 8784221 is about 2963.8186516722. The cubic root of 8784221 is about 206.3325526896.

The spelling of 8784221 in words is "eight million, seven hundred eighty-four thousand, two hundred twenty-one".