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138 (number)
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138 1, 2, 3, 6, 23, 46, 69, 138
138 (one hundred [and] thirty-eight) is the natural number following 137 and preceding 139.
Mathematics
138 is a sphenic number,A007304 Sphenic numbers: products of 3 distinct primes. 2023-07-24 an Ulam number,A002858 Ulam numbers 2023-07-24 an abundant number,A005101 Abundant numbers (sum of divisors of m exceeds 2m). 2023-07-24 and a square-free congruent number.A006991 Primitive congruent numbers. 2023-07-24
left|200px|thumb|Four concentric magic circles, with a magic constant of 138.
References
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Category:Integers