Il numero romano CDXXXVIII nel sistema decimale vale: 438.
CDXXXVIII in latino si scrive quadringenti triginta octo,
mentre in italiano quattrocentotrentotto.
CDXIX, CDXX, CDXXI, CDXXII, CDXXIII, CDXXIV, CDXXV, CDXXVI, CDXXVII, CDXXVIII, CDXXIX, CDXXX, CDXXXI, CDXXXII, CDXXXIII, CDXXXIV, CDXXXV, CDXXXVI, CDXXXVII, CDXXXIX, CDXL, CDXLI, CDXLII, CDXLIII, CDXLIV, CDXLV, CDXLVI, CDXLVII, CDXLVIII, CDXLIX, CDL, CDLI, CDLII, CDLIII, CDLIV, CDLV, CDLVI, CDLVII