The numbers 4, 8, 12, and 16 are all even integers. They are part of the sequence of natural numbers and can be divided by 2 without leaving a remainder. Each number increases by 4 from the previous one, forming a simple arithmetic progression. These numbers also have various applications in mathematics and everyday life. For example, 4 represents the number of sides in a square, while 8 is the number of bits in a byte. 12 is often associated with a dozen, and 16 can refer to the number of ounces in a gallon.