MMDCCCXXV is already in Roman numerals and it is equivalent to 2825
MMDCCCXXV is 2825
That IS a roman number.
roman numarals are v,i ,x,c and some other stuff with represent numbers
XII
L
Your answer is XXI
CCCLXII
DCC
1 = I
XXXIX
538
XII
CXXVI
in roman X