The Roman numeral $\text{MCCLXXXIV}$ is calculated as follows: $$ \begin{aligned} \mathrm{M} &= 1000 \\ \mathrm{CC} &= 200 \\ \mathrm{L} &= 50 \\ \mathrm{XXX} &= 30 \\ \mathrm{IV} &= 4 \\ \text{Total} &= 1000 + 200 + 50 + 30 + 4 = 1284 \end{aligned} $$