2638

2638 is a natural number that follows 2637 and precedes 2639. It is a four-digit, even composite number.

Its prime factorization is 2 × 1319, and since 1319 is prime, 2638 is a semiprime (the product of exactly two primes). As a consequence, its divisors are 1, 2, 1319, and 2638.

In decimal notation it is simply 2638. In other common bases, it is represented as follows: binary 101001001110, octal 5116, and hexadecimal A4E. In Roman numerals, 2638 is written as MMDCXXXVIII.

If used as a year, 2638 would fall in the 27th century of the Anno Domini era. The number has no widely cited mathematical constant or widely recognized historical significance beyond its basic arithmetic properties.

Summary of key properties:

- Even and composite

- Prime factorization: 2 × 1319

- Semiprime

- Representations: binary 101001001110; octal 5116; decimal 2638; hexadecimal A4E; Roman MMDCXXXVIII

2638 serves as an example of a modest semiprime with a simple factorization, and it illustrates how the same integer can be expressed across multiple numeral systems.