4400

4400 is the natural number that comes after 4399 and before 4401. In prime factorization, 4400 equals 2^4 × 5^2 × 11. It is an even composite number and a multiple of 11 and 25. As a decimal numeral, it ends in two zeros.

4400 (also known as The 4400) is an American science fiction television series created by Scott Peters. It aired on USA Network from 2004 to 2007. The premise centers on 4,400 people who vanish at various times in the past and return all at once, with no memory of their disappearances and with new abilities. They are monitored by a federal agency as investigators try to understand the phenomenon and its implications. The show centers on a small group of protagonists, including a federal agent and other investigators, as they track the returned individuals and uncover a broader conspiracy. The series is noted for its serialized storytelling and a blend of mystery, social commentary, and character-driven drama. It ran for four seasons and developed a dedicated fan base, though the finale left several questions unresolved about the origin of the 4400s and the purpose of their powers.