Number
39 in Roman numerals
39 is written XXXIX
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 XXXIX is built
Roman numerals are written one decimal place at a time, largest first.
- XXXtens · 3X written 3 times: 3 × 10 = 30.
- IXones · 9I before X means 10 − 1 = 9. This saves writing VIIII.
30 + 9 = 39
The pair IX 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 XXXVIIII (8 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today XXXIX (5 letters) is the standard.
About the number 39
- 39 is odd and can be split into prime factors: 3 × 13, or in Roman numerals III × XIII.
- XXXIX has 5 letters. 604 of the numbers up to 1,000 have longer numerals.
Counting from 31 to 40
| Number | Roman numeral |
|---|---|
| 31 | XXXI |
| 32 | XXXII |
| 33 | XXXIII |
| 34 | XXXIV |
| 35 | XXXV |
| 36 | XXXVI |
| 37 | XXXVII |
| 38 | XXXVIII |
| 39 | XXXIX |
| 40 | XL |