8886721 has 2 divisors, whose sum is σ = 8886722. Its totient is φ = 8886720.

The previous prime is 8886707. The next prime is 8886781. The reversal of 8886721 is 1276888.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5574321 + 3312400 = 2361^2 + 1820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8886721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8886701) 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 as a sum of consecutive naturals, namely, 4443360 + 4443361.

It is an arithmetic number, because the mean of its divisors is an integer number (4443361).

Almost surely, 2^8886721 is an apocalyptic number.

It is an amenable number.

8886721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8886721 is an equidigital number, since it uses as much as digits as its factorization.

8886721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 40.

The square root of 8886721 is about 2981.0603818105. The cubic root of 8886721 is about 207.1319920240.

It can be divided in two parts, 88867 and 21, that added together give a palindrome (88888).

The spelling of 8886721 in words is "eight million, eight hundred eighty-six thousand, seven hundred twenty-one".