9855 (nine thousand eight hundred fifty-five) is the natural number following 9854 and preceding 9856. An odd and composite number, its prime factors are 3, 5, and 73 and its prime factorization is:
It is the sum of all the numbers in any given row, column, or diagonal of the 27 ÃÂ 27 magic square, as shown in the following calculation:
The 27 ÃÂ 27 magic square contains 1 to 729, with 365 in the center.
9855 is also the number of days in 27 years; C.A. Brown hypothesized in a 1906 edition of The Monist that this number could have held a significance for Ancient Greeks as the "dividing line between the ages when men and women should begin to bear children to the State, 20-27 years for women, 27-34 years for men"