Il numero romano MDXXIII nel sistema decimale vale: 1523.
MDXXIII in latino si scrive mille quingenti viginti tres,
mentre in italiano millecinquecentoventitré.
MDIV, MDV, MDVI, MDVII, MDVIII, MDIX, MDX, MDXI, MDXII, MDXIII, MDXIV, MDXV, MDXVI, MDXVII, MDXVIII, MDXIX, MDXX, MDXXI, MDXXII, MDXXIV, MDXXV, MDXXVI, MDXXVII, MDXXVIII, MDXXIX, MDXXX, MDXXXI, MDXXXII, MDXXXIII, MDXXXIV, MDXXXV, MDXXXVI, MDXXXVII, MDXXXVIII, MDXXXIX, MDXL, MDXLI, MDXLII