Il numero romano MDCXL nel sistema decimale vale: 1640.
MDCXL in latino si scrive mille sescenti quadraginta,
mentre in italiano milleseicentoquaranta.
MDCXXI, MDCXXII, MDCXXIII, MDCXXIV, MDCXXV, MDCXXVI, MDCXXVII, MDCXXVIII, MDCXXIX, MDCXXX, MDCXXXI, MDCXXXII, MDCXXXIII, MDCXXXIV, MDCXXXV, MDCXXXVI, MDCXXXVII, MDCXXXVIII, MDCXXXIX, MDCXLI, MDCXLII, MDCXLIII, MDCXLIV, MDCXLV, MDCXLVI, MDCXLVII, MDCXLVIII, MDCXLIX, MDCL, MDCLI, MDCLII, MDCLIII, MDCLIV, MDCLV, MDCLVI, MDCLVII, MDCLVIII, MDCLIX