There are over 1m mobile apps

"Somewhere at a computer last Wednesday, a developer pushed a button and the one millionth mobile app went to market.
Apps shrink the programs that were once available only on a desktop computer to make them usable on smartphones and mobile devices — stock trades, restaurant reviews, Facebook, streaming radio, photographs, news articles, videos and, of course, Angry Birds.
The pace of new app development dwarfs the release of other kinds of media. “Every week about 100 movies get released worldwide, along with about 250 books,” said Anindya Datta, the founder and chairman of Mobilewalla, which helps users navigate the mobile app market. “That compares to the release of around 15,000 apps per week.”
According to Mobilewalla, in a fairly quiet 14 days before the release of app No. 1,000,000, an average of 543 apps were released each day for Android-based devices, and an average of 745 apps hit the market daily for the iPhone, iPad and iTouch. The total for the two weeks across the Apple, Android, BlackBerry and Windows platforms was 20,738."

Source:  New York Times, 11th December 2011