The 4 in 42018 stands for the ten thousands position.
IV = 4
64 = 50 + 10 + 4
IV is the roman numeral for number 4... so iv stands for number 4....
It is not a valid Roman numeral
Sorry there is no 'R' in roman numeral
406
4. The roman numeral for 4 is IV.
in roman numeral on conversion L stands for 50.
50
1500
649
CLXXVI