Number
604 in Roman numerals
604 is written DCIV
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How DCIV is built
Roman numerals are written one decimal place at a time, largest first.
- DChundreds · 6D (500) plus C (100) makes 600.
- IVones · 4I before V means 5 − 1 = 4. This saves writing IIII.
600 + 4 = 604
The pair IV uses subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not DCIIII (6 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today DCIV (4 letters) is the standard.
- There's no letter for zero. The zero is simply left out, which is why 604 has 2 parts, not 3.
About the number 604
- 604 is even and can be split into prime factors: 2 × 2 × 151, or in Roman numerals II × II × CLI.
- DCIV has 4 letters. 784 of the numbers up to 1,000 have longer numerals.
Counting from 601 to 610
Every number from 601 to 610 starts DC (600); only the ending changes.
| Number | Roman numeral |
|---|---|
| 601 | DCI |
| 602 | DCII |
| 603 | DCIII |
| 604 | DCIV |
| 605 | DCV |
| 606 | DCVI |
| 607 | DCVII |
| 608 | DCVIII |
| 609 | DCIX |
| 610 | DCX |