43 (forty-three) is a positive integer following 42 and preceding 44. Its ordinal form is written "forty-third" or 43rd.

Properties Edit

43 is an odd prime number.

It is the fourth number of Sylvester's sequence.

The first naturally occurring radioactive element is Technetium, with atomic number 43.

In googology Edit

In Greek-based number-naming systems, 43 is associated with prefix "tritetraconta-", and with prefix "trequadraginti-" in Latin systems.