In The Penguin Dictionary of Curious and Interesting Numbers, 39 is described as
This appears to be the first uninteresting number, which of course makes it an especially interesting number, because it is the smallest number to have the property of being uninteresting. It is therefore also the first number to be simultaneously interesting and uninteresting.
In Greek-based number-naming systems, 39 is associated with prefix "enneatriaconta-", and with prefix "novemtriginti-" in Latin systems.
- David Wells. "The Penguin Book of Curious and Interesting Numbers: Revised Edition" Penguin Books 1998.