8447987 has 2 divisors, whose sum is σ = 8447988. Its totient is φ = 8447986.

The previous prime is 8447981. The next prime is 8448007. The reversal of 8447987 is 7897448.

8447987 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 not a de Polignac number, because 8447987 - 2⁸ = 8447731 is a prime.

It is not a weakly prime, because it can be changed into another prime (8447981) 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 as a sum of consecutive naturals, namely, 4223993 + 4223994.

It is an arithmetic number, because the mean of its divisors is an integer number (4223994).

Almost surely, 2^8447987 is an apocalyptic number.

8447987 is a deficient number, since it is larger than the sum of its proper divisors (1).

8447987 is an equidigital number, since it uses as much as digits as its factorization.

8447987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 47.

The square root of 8447987 is about 2906.5421036001. The cubic root of 8447987 is about 203.6656303176.

The spelling of 8447987 in words is "eight million, four hundred forty-seven thousand, nine hundred eighty-seven".