any calculate will give you similar result. monthly payment 1900

from bankrate:

 Mar. 2012$1,909.66 $576.33 $1,333.33 $1,333.33 $399,423.67

 April 2012$1,909.66 $578.25 $1,331.41 $2,664.75 $398,845.42

 May 2012$1,909.66 $580.18 $1,329.48 $3,994.23 $398,265.25 

June 2012$1,909.66 $582.11 $1,327.55 $5,321.78 $397,683.14 

I didn't use any calculate first, just simple 400k x 4% = $16000, that should be roughly your annual interest cost.