3861

3861 is a natural number that lies between 3860 and 3862. In mathematics, it has prime factorization 3^3 × 11 × 13, making it a composite number.

It has 16 positive divisors. A complete list of divisors is: 1, 3, 9, 27, 11, 33, 99, 297, 13, 39, 117, 351, 143, 429, 1287, 3861.

Sum of all divisors is 6720, which yields a sum of proper divisors equal to 2859. Therefore, 3861 is a deficient number, since the sum of its proper divisors is less than the number itself.

The number is divisible by 9 (3861 = 9 × 429) and by 27 (3861 = 27 × 143); its digital root is 9, reflecting its divisibility by 9.

Representations in other bases include binary 111100010101, octal 7425, and hexadecimal 0F15. In Roman numerals, 3861 is written as MMMDCCCLXI (3000 + 800 + 60 + 1).

As a numeric identifier, 3861 can appear in various catalogs, models, or archival references. Apart from its mathematical properties, there is no universally recognized historical or cultural meaning attached to the number itself.