Il numero romano MMMMCXXXVIII nel sistema decimale vale: 4138.
MMMMCXXXVIII in latino si scrive quattuor milia centum triginta octo,
mentre in italiano quattromilacentotrentotto.
MMMMCXIX, MMMMCXX, MMMMCXXI, MMMMCXXII, MMMMCXXIII, MMMMCXXIV, MMMMCXXV, MMMMCXXVI, MMMMCXXVII, MMMMCXXVIII, MMMMCXXIX, MMMMCXXX, MMMMCXXXI, MMMMCXXXII, MMMMCXXXIII, MMMMCXXXIV, MMMMCXXXV, MMMMCXXXVI, MMMMCXXXVII, MMMMCXXXIX, MMMMCXL, MMMMCXLI, MMMMCXLII, MMMMCXLIII, MMMMCXLIV, MMMMCXLV, MMMMCXLVI, MMMMCXLVII, MMMMCXLVIII, MMMMCXLIX, MMMMCL, MMMMCLI, MMMMCLII, MMMMCLIII, MMMMCLIV, MMMMCLV, MMMMCLVI, MMMMCLVII