The number 40 is an even integer that comes after 39 and before 41. It is often associated with various cultural and historical references, such as the 40 days and nights of rain in the biblical story of Noah's Ark. In mathematics, 40 can be divided by several numbers, including 1, 2, 4, 5, 8, 10, 20, and 40 itself, making it a composite number. In everyday life, 40 can represent milestones, such as turning 40 years old, which is often seen as a significant birthday. Additionally, in sports, 40 is a common jersey number worn by many famous athletes, symbolizing strength and achievement.