The book of numbers is largely Narrative History as far as its genre. It was written by Moses about 1450-1410 B.C. It describes Moses taking two population censuses, hence the name Numbers.
Moses wrote Deuteronomy to remind the Israelites of what God had done and to remind them of what God expects of them. The name literally means “Second Law”. Moses gives “the Law” for the second time.
Leviticus was written to draw the Israelites to the understanding of the infinite holiness of God, and that He desires them to act in a holy manner toward Him. – BIBLEHUB