138 (one hundred [and] thirty-eight) is the natural number following 137 and preceding 139.
138 is a sphenic number, the sum of four consecutive primes (29 + 31 + 37 + 41), and the smallest product of 3 primes, such that in base 10, the third prime is a concatenation of the other two: 2 ⋅ 3 ⋅ 23 .
138 is the third 47-gonal number and an Ulam number, as well as a 1 step palindrome (138 + 831 = 969.)
138 is the 72nd normal Congruent number and the 49th primitive or square free congruent number.
138 Tolosa is a brightly colored, stony Main belt asteroidThe New General Catalogue object NGC-138, a spiral galaxy in the constellation PiscesThe Saros number of the solar eclipse series which began on June 6, 1472 and will end on July 11, 2716. The duration of Saros series 138 is 1244 years, and it contains 70 solar eclipses138P/Shoemaker-Levy is a periodic comet in the Solar SystemUnited States Air Force 138th Fighter Wing fighter unit stationed at Tulsa International Airport, OklahomaUSS Advocate (AM-138) was a United States naval ship, transferred to the Soviet Navy in 1943USS Braxton (APA-138) was a United States Navy Haskell-class attack transport during World War IIUSS Cheleb (AK-138) was a United States Navy Crater-class cargo ship during World War IIUSS Douglas L. Howard (DE-138) was a United States Navy destroyer escort during World War IIUSS General C. G. Morton (AP-138) was a United States Navy General G. O. Squier transport ship during World War IIUSS Kennison (DD-138) was the United States Navy Wickes class destroyer during World War II138th Street–Grand Concourse, the Bronx station on the IRT Jerome Avenue Line of the New York City SubwayThird Avenue–138th Street, the Bronx station on the IRT Pelham Line of the New York City SubwayAmerican singer Glenn Danzig wrote a song entitled "We are 138", recorded in 1978 by the Misfits, and reputedly inspired by the George Lucas film THX-1138.1.3.8., a compilation by slam metal band Devourment138 is a commonly used tempo in trance music, specifically uplifting trance music. Armin van Buuren created a song called "Who's Afraid of 138?!" as a reference to this. This also led to a record label being created by Armin van Buuren also called "Who's Afraid of 138?!" and is currently a sublabel of Armada Music138 is also:
The year AD 138 or 138 BCThe atomic number of Untrioctium, a temporary chemical elementPsalm 138Sonnet 138 by William Shakespeare