400
WordPress has kindly decided to remind me that this is my 400th post on my blog. I had previously done posts once every hundred posts (100 and 200) however I don’t really see the need seen as there is a search box on the right of this post.
Instead I thought that it would be interesting to look at the number 400. I don’t normally spend much time thinking about numbers and most of these facts about the number 400 have been obtained from the web however if you do want an interesting book about numbers I recommend Number Freak by Derrick Niederman which I got for my birthday last year.
Anyway, here are my interesting facts about the number 400:
- 400 is the HTTP Bad Client request response code
- 400 is the square of 20
- Children laugh about 400 times a day
- The Gregorian calendar runs on 400 year cycles
- 400 is a Harshad number
- It took my app 20 hours to get 400 downloads (it has now had over 8000)
- It is divisible by 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200 and 400
- The closest primes are 397 and 401
- The wealthiest 400 Americans now have more wealth than the poorest 150 million combined
- Nestle has 400 factories
- Canadian teenagers put a LEGO figure into space for $400
- 400 million people use Facebook every day
- In April 2000 (4-00 date) the United States vs. Microsoft case came to an end
- The roman numerals are CD
- In binary it is 110010000
- It is 620 in base 8 (octal) and 190 in base 16 (hexadecimal)
If anyone else has any interesting facts about 400 please feel free to send them to me.




