8447 has 2 divisors, whose sum is σ = 8448.
Its totient is φ = 8446.
The previous prime is 8443. The next prime is 8461. The reversal of 8447 is 7448.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 8447 - 22 = 8443 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (8443) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4223 + 4224.
It is an arithmetic number, because the mean of its divisors is an integer number (4224).
8447 is a deficient number, since it is larger than the sum of its proper divisors (1).
8447 is an equidigital number, since it uses as much as digits as its factorization.
8447 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 896, while the sum is 23.
The square root of 8447 is about 91.9075622569.
The cubic root of 8447 is about 20.3657698416.
Subtracting from 8447 its reverse (7448), we obtain a palindrome (999).
It can be divided in two parts, 84 and 47, that added together give a palindrome (131).
The spelling of 8447 in words is "eight thousand, four hundred forty-seven".