Jamieson, Fausset and Brown on 1 Chronicles 19:7

7. So they hired thirty and two thousand chariots--Hebrew, "riders," or "cavalry," accustomed to fight either on horseback or in chariots, and occasionally on foot. Accepting this as the true rendering, the number of hired auxiliaries mentioned in this passage agrees exactly with the statement in 2Sa 10:6: twenty thousand (from Syria), twelve thousand (from Tob), equal to thirty-two thousand, and one thousand with the king of Maachah.