The number 400

What is significant about the number 400?

400 is 20²
400 is divisible by: 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400
400 equals 2⁴ * 5² or ( 2*2*2*2*5*5)
400 is a self-number which are generated by this formula: $C_k = 8 \cdot 10^{k - 1} + C_{k - 1} + 8$
You can write 400 like this: four hundred, which is referred to as its Cardinal representation
400 comes after 399 and 401 follows 400
400² is 160000
An HTTP Status code of 400 means, Bad Request, which could not be understood by the server due to a malformed syntax.
6 minutes and 40 seconds is equal to 400 seconds
400 is a Harshad number
400 can be represented in Greek by Υ´
The scientific notation of 400 is 4 * 10²
There was an Atari 400 computer, my first computer was an Atari 1200XL
400 in binary is 110010000
400 is represented in Roman number CD
There are 400 days in a Gregorian calendar
400 in hexadecimal is 0x190
The Sun is 400 times larger than the moon and 400 times further away from the Earth
Counting to 400 will take about 3 minutes
There is a Forbes 400 list of richest people which I am not on
There are 400 grades in a circle

Lastly, the number 400 is the number of articles I have written and posted to the MSDN platform. This is my 400th.

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