Il numero romano MMDCXC nel sistema decimale vale: 2690.
MMDCXC in latino si scrive duo milia sescenti nonaginta,
mentre in italiano duemilaseicentonovanta.
MMDCLXXI, MMDCLXXII, MMDCLXXIII, MMDCLXXIV, MMDCLXXV, MMDCLXXVI, MMDCLXXVII, MMDCLXXVIII, MMDCLXXIX, MMDCLXXX, MMDCLXXXI, MMDCLXXXII, MMDCLXXXIII, MMDCLXXXIV, MMDCLXXXV, MMDCLXXXVI, MMDCLXXXVII, MMDCLXXXVIII, MMDCLXXXIX, MMDCXCI, MMDCXCII, MMDCXCIII, MMDCXCIV, MMDCXCV, MMDCXCVI, MMDCXCVII, MMDCXCVIII, MMDCXCIX, MMDCC, MMDCCI, MMDCCII, MMDCCIII, MMDCCIV, MMDCCV, MMDCCVI, MMDCCVII, MMDCCVIII, MMDCCIX