684 in Roman Numerals
684
DCLXXXI (subtracted)V
six hundred eighty-four
How DCLXXXIV is formed
| Place | Value | Symbols |
|---|---|---|
| Hundreds | 600 | DC |
| Tens | 80 | LXXX |
| Units | 4 | I (subtracted)V |
| Total | 684 | DCLXXXIV |
DCLXXXIV is written one place at a time, from the largest to the smallest: DC (600) + LXXX (80) + IV (4) = 684.
IV is the only subtraction: the I before the V takes away 1, so IV = 4.
Common mistakes
Wrong: DCLXXXIIII
Why isn't 684 written as DCLXXXIIII?
A symbol can't be repeated four times in a row. 4 is IV (5 − 1), not IIII, so 684 is DCLXXXIV.
Wrong: DCXXCIV
Why isn't 684 written as DCXXCIV?
Only one smaller symbol can stand before a larger one, so XXC doesn't work. 80 is LXXX (50 + 30), so 684 is DCLXXXIV.
Numbers near 684
Properties of 684
- Prime factors
- 2² × 3² × 19
- Divisors
- 18 divisors1, 2, 3, 4 … 684
- Even or odd
- Even
- Prime number
- No
- Letters in DCLXXXIV
- 8
684,000 in Roman numerals
With a bar over it (vinculum), D̅C̅L̅X̅X̅X̅I̅V̅ means 684 × 1,000 = 684,000. How Roman numerals work