Il numero romano MDCLXXXIV nel sistema decimale vale: 1684.
MDCLXXXIV in latino si scrive mille sescenti octoginta quattuor,
mentre in italiano milleseicentottantaquattro.
MDCLXV, MDCLXVI, MDCLXVII, MDCLXVIII, MDCLXIX, MDCLXX, MDCLXXI, MDCLXXII, MDCLXXIII, MDCLXXIV, MDCLXXV, MDCLXXVI, MDCLXXVII, MDCLXXVIII, MDCLXXIX, MDCLXXX, MDCLXXXI, MDCLXXXII, MDCLXXXIII, MDCLXXXV, MDCLXXXVI, MDCLXXXVII, MDCLXXXVIII, MDCLXXXIX, MDCXC, MDCXCI, MDCXCII, MDCXCIII, MDCXCIV, MDCXCV, MDCXCVI, MDCXCVII, MDCXCVIII, MDCXCIX, MDCC, MDCCI, MDCCII, MDCCIII