138 (number)

138 (One hundred and thirty-eight) is the natural number following 137 and preceding 139.

Mathematics:

• 138 is an even number.
• 138 is a composite number. Its proper divisors are 1, 2, 3, 6, 23, 46, 69.
• 138 is the sum of six consecutive primes (13 + 17 + 19 + 23 + 29 + 37).
• 138 is a Harshad number (divisible by the sum of its digits) in base 10.

Other Potential Significance:

• 138 is sometimes used as a code or reference number, though its specific meaning would be context-dependent.
• The number 138 may appear in various systems of measurement or categorization, again dependent on the specific application.