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138 (number)

FieldValue
number138
divisor1, 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, an Ulam number, an abundant number, and a square-free congruent number.

References

References

  1. {{Cite OEIS. A007304. Sphenic numbers: products of 3 distinct primes.
  2. {{Cite OEIS. A002858. Ulam numbers
  3. {{Cite OEIS. A005101. Abundant numbers (sum of divisors of m exceeds 2m).
  4. {{Cite OEIS. A006991. Primitive congruent numbers.
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