Is 39-28-40 hourglass

Possibly.

According to the numbers, it's not, because an hourglass figure must have a waist that is at least 25% smaller than the hips and bust (which should be nearly identical), meaning that the measurements should be 40-30-40.

However, the best way to figure it out is to look at yourself in the mirror. An hourglass shape has a narrow waist and full, proportionate hips and bust. Is that what you look like?