The book of numbers is largely Narrative History as far as its genre. It was written by Moses about 1450-1410 B.C. Key personalities include Moses, Aaron, Miriam, Joshua, Caleb, Eleazar, Korah, and Balaam.
The purpose of the book of Numbers is to tell about how Israel prepared to enter the promise land, but sinned and was punished. It describes Moses taking two population censuses, hence the name Numbers.