Crump, Thomas.The Anthropology of Numbers. Cambridge University Press, 1992. Explains the part numbers play across cultures.
Enzensberger, Hans Magnus.Trans. Michael Henry Heim.The Number Devil: A Mathematical Adventure. Metropolitan, 1998. Through a series of dreams, a young boy who hates math explores the amazing world of numbers, including infinite, prime, and Fibonacci numbers. For younger readers.
Maor, Eli.e: The Story of a Number. Princeton University Press, 1994, 1998. A mathematician discusses the history of a number important in theoretical mathematics; intended for the general reader.