3921

3921 is an integer that follows 3920 and precedes 3922. In Roman numerals it is written MMMCMXXI, and in scientific notation it equals 3.921 × 10^3. It can also be expressed in base 2 as 111101010001 and in hexadecimal as 0xF51.

In mathematics, 3921 factors as 3 × 1307, where 1307 is a prime number. Therefore the divisors of 3921 are 1, 3, 1307, and 3921. It is an odd composite number and is congruent to 1 modulo 4 (3921 ≡ 1 (mod 4)). The sum of its digits is 15, which is divisible by 3 but not by 9, and the number itself is not a perfect square or a higher power.

As a four-digit identifier, 3921 may appear in various catalogs, model numbers, or numbering schemes. Like other integers, it can be used as a year label in a hypothetical future timeline, such as 3921 CE. In scientific contexts, numbers such as 3921 are commonly found in numerical designations for objects in catalogs, databases, or inventories, without implying a specific real-world significance.

Overall, 3921 is most notable for its simple factorization and its representations across different bases. It serves as an example of a small composite number with a straightforward factorization and standard numeral forms.

See also: integer, prime factorization, numeral systems.