3900

3900 is a positive integer. In prime factorization terms, 3900 equals 2^2 × 3 × 5^2 × 13, which makes it a composite number. It is divisible by 1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 25, 26, 30, 39, 50, 60, 75, 78, 100, 130, 195, 325, 390, 650, 975, 1950, and 3900. It is a Harshad number in base 10, since the sum of its digits is 3 + 9 + 0 + 0 = 12 and 3900 ÷ 12 = 325. The number is also a multiple of 100 and 39, reflecting its factorization.

Numeral representations include decimal 3900, Roman MMMCM, binary 111100111100, octal 7474, and hexadecimal F3C. In Roman numerals, 3900 is written as MMMCM, where MMM represents 3000 and CM represents 900. In binary, 3900 equals 111100111100, and in hexadecimal it is F3C. The octal representation is 7474.

As a calendar reference, 3900 may denote the year 3900 CE or 3900 BCE, depending on context, but there are no widely noted historical events universally associated with that year. In mathematics and computing, 3900 is often used as an example of a large composite number, a factorization exercise, or as a numeric label in catalogs and product codes.