840 in Roman Numerals
840 in Roman numerals is DCCCXL, and is spelled eight hundred forty.
How to write 840 in Roman numerals
To write 840 in Roman numerals, combine DCCC (800) and XL (40) to get DCCCXL.
The numeral DCCCXL is read from left to right, from the largest value to the smallest, adding each symbol as you go. It uses subtractive notation — XL — where a smaller symbol placed before a larger one is subtracted rather than added (for example, XL means 50 − 10 = 40).
| Value | Roman |
|---|---|
| 800 | DCCC |
| 40 | XL |
| 840 | DCCCXL |
Facts about the number 840
- 840 is an even number.
- 840 is a composite number. Its prime factorization is 23 × 3 × 5 × 7.
- The digits of 840 add up to 12.
- 840 has 32 divisors.
840 in other number systems
| Decimal | 840 |
| Roman | DCCCXL |
| Binary | 1101001000 |
| Octal | 1510 |
| Hexadecimal | 348 |
Frequently asked questions
How do you write 840 in Roman numerals?
840 is written as DCCCXL in Roman numerals.
What does the Roman numeral DCCCXL mean?
DCCCXL represents the number 840 (eight hundred forty).
Is 840 a prime number?
No, 840 is a composite number.
What is 840 in binary and hexadecimal?
840 is 1101001000 in binary and 348 in hexadecimal.
Related numbers
Or open 840 in the converter and browse the full Roman numerals chart.