138 (number)
138 (one hundred ndthirty-eight) is the natural number following 137 and preceding 139.
In mathematics
138 is a sphenic number, the sum of four consecutive primes (29 + 31 + 37 + 41), and the smallest product of three primes, such that in base ...
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138 BC
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Year 138 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Serapio and Callaicus (or, less frequently, year 616 ''Ab urbe condita'') and the Third Year of Jianyuan. The denominati ...
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AD 138
Year 138 ( CXXXVIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Niger and Camerinus (or, less frequently, year 891 ''Ab urbe con ...