9859

9859 is the natural number that comes after 9858 and before 9860. In mathematics, 9859 is a prime number. It is odd and ends with 9, and its digits sum to 31, which means it is not divisible by 2 or 3. It is congruent to 3 modulo 4, and it has no divisors other than 1 and itself. As a four-digit prime, 9859 is a member of the sequence of prime numbers and is sometimes cited in examples illustrating primality tests.

Beyond pure mathematics, 9859 may appear as an identifier, model number, or code in catalogs and databases. However, it does not have a widely recognized meaning or significance beyond its primality as a four-digit prime. In contexts such as education or programming, it can be used as an example prime for illustrating simple primality checks or indexing.

See also: List of prime numbers; Four-digit numbers.