That's your best share, meaning your best difficulty. So you rolled the dice and rolled a 400M when your previous best was only 20M. So that's pretty good. If you roll 115 trillion, you get a block reward.
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Ahh I see..
Aren't you suppose to mine a hash under a certain number? Shouldn't it be the lowest the better?
In terms of raw block hash, yes. More leading zeros = lower value = more difficult.