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Unique Properties of 405

  • 405 is the smallest composite number that is the sum of two, three, four, and five consecutive composite numbers (405 = 202 + 203 = 134 + 135 + 136 = 99 + 100 + 102 + 104 = 78 + 80 + 81 + 82 + 84)
  • 405 is the smallest number with 10 odd divisors

Common Properties of 405

Composite
Deficient
Odd
Odious