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I think you should talk to your landlord and see what you can do.

The security deposit usually shouldn't be used to cover things like this if a tenant does abandon the property then yeah the landlord can and will retain the security deposit to cover the rent. Of course this doesn't help if the security deposit is required to do any repairs as well.

You are responsible for the full $599 for the month of April so you should pay it. Since you are planning on leaving early and that may work to the landlord's advantage you should talk to them and see if you can get a reduced rate for that month. You aren't living there so utilities will be reduced. Maybe they were planning to go in and do some work after you left; this gives them a chance to do it sooner.

However it is VERY short notice though so they might not be able to do anything.

If they don't let you out, it's only $200 difference between being a man and honouring your contract and abandoning it. Do the right thing, you're going to be ahead in the long run anyway.

EDIT: That's true, if the landlord makes a reasonable attempt to rent out the property and can't, he can even go so far as to take you to court to get the money. I doubt he would in your case because it's only $200 (assuming there's nothing to be repaired with the security deposit). But he's not getting much time to rent for April so he'd have a good case. And if there ARE things that need to be repaired, then he might just do it, and that's not something you'd want to go through just to save $200.