8939891 has 2 divisors, whose sum is σ = 8939892. Its totient is φ = 8939890.

The previous prime is 8939863. The next prime is 8939921. The reversal of 8939891 is 1989398.

8939891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8939891 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8939831) 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, 4469945 + 4469946.

It is an arithmetic number, because the mean of its divisors is an integer number (4469946).

Almost surely, 2^8939891 is an apocalyptic number.

8939891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8939891 is an equidigital number, since it uses as much as digits as its factorization.

8939891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 8939891 is about 2989.9650499630. The cubic root of 8939891 is about 207.5442669383.

The spelling of 8939891 in words is "eight million, nine hundred thirty-nine thousand, eight hundred ninety-one".