That makes sense. Coming up with a good username is usually a pain.

31959
You know those verification codes, right.
Well, I was logging into my account on another website and the letters I had to write formed ERCHNC
and I modified it a little.

Then what line of thought was used when creating this username?

31647
Not entirely random, but yes.

It means nothing... So it"s just some random thing you typed in one day?