3639

3639 is a natural number that follows 3638 and precedes 3640. In mathematics, it is an odd composite number with a prime factorization of 3 × 1213, where 1213 is prime. Therefore, 3639 is a semiprime (the product of two primes). Its positive divisors are 1, 3, 1213, and 3639.

Because 3639 is an odd number, it has four representations as a sum of consecutive integers (including representations with positive or negative starting terms). These correspond to the four odd divisors: 1, 3, 1213, and 3639. For example, one representation with length three is 1212 + 1213 + 1214 = 3639.

In modular arithmetic, 3639 is congruent to 3 modulo 9, since the sum of its digits (3 + 6 + 3 + 9) equals 21, which leaves a remainder of 3 when divided by 9. It is divisible by 3 but not by 9.

Beyond its role as a number, 3639 does not have widely recognized standard meanings in science, culture, or geography. It is primarily encountered as a numeric label in arithmetic, combinatorics, and related mathematical contexts.