86 (number)

In mathematics

• nontotient and a noncototient.
• the 25th distinct semiprime and the 13th of the form.
• an Erdős–Woods number, since it is possible to find sequences of 86 consecutive integers such that each inner member shares a factor with either the first or the last member.
• a happy number and a self number in base 10.

In science

• 86 is the atomic number of radon.
• There are 86 metals on the modern periodic table.

  In other fields

• The number of the French department Vienne. This number is also reflected in the department's postal code and in the name of a local basketball club, Poitiers Basket 86.
• +86 is the code for international direct dial phone calls to China.
• An art gallery in Ventura, California displaying art pieces from such artists Billy Childish, Stacy Lande and Derek Hess; most of which include the number *86 hidden or overtly shown in the art; some of which fall under the genre of lowbrow.
• 86 is the device number for a lockout relay function in electrical engineering electrical circuit protection schemes. Likely originating in reference to this device number, in American English 86 has become a slang term for cancelling something.
• 86 is often used in Japan as the nickname for the Toyota AE86.