The number 6872 as a Roman numeral would be (VI)DCCCLXXII
It's already a numeric number
4020096 IS in numeric form.
8 in numeric numbers is VIII.
LXXV
Nineteen.
(VIII)
(XXII)
MMMMMMMMMMMMMD
8,400
XCIV
we write 5 in roman number like this :- V
A number must, surely, be numeric! I suggest writing it as 24000.