(VI)
The numeric representation of 6000 is simply 6000.
You have written 17 in numeric numbers in your question.
They are already expressed as numeric numbers.
You do not write numbers in exponent for in words.
8 in numeric numbers is VIII.
1995 in "numeric numbers"(?) is 1995. In Roman numerals it would be MCMXCV.
XX
5000
DD
CV
MCDXXXVI
45,000