You could use a simple calculator like
http://www.moneychimp.com/calculator/compound_interest_calculator.htmto double check that math.
With the following inputs...
Current Principal: $200,000
Annual Addition: $23,000 (max contribution in 2013 + catchup)
Years to Grow: 14 (retire at 64..."before age 65")
Interest rate: 5% (this is the only unknown so I guessed)
Result: $869,293
Grow a bigger mustache to save a bit more over that 14 year period and you've got yourself a million. Of course if your mustache grows while you're saving and you can live on a smaller amount of money, you may no longer need to get up to a million.
Play around with the numbers and see how things change. Keep in mind it's all just a wild guess.
Hope this helps!