105 (number)

105 is a natural number following 104 and preceding 106.

Mathematics

• 105 is a composite number. Its divisors are 1, 3, 5, 7, 15, 21, 35, and 105.
• 105 is the product of the first three odd prime numbers (3 × 5 × 7).
• 105 is a sphenic number, meaning it is a positive integer that is the product of three distinct prime numbers.
• 105 is a triangular number, specifically the 14th triangular number (1 + 2 + 3 + ... + 14 = 105).
• 105 is also a hexagonal number.
• 105 is a Harshad number in base 10 (divisible by the sum of its digits, 1 + 0 + 5 = 6).
• The totient of 105 is 48.

Other Fields

• 105 is the emergency telephone number in some countries.
• In certain contexts, 105 can refer to a highway or route number.
• The atomic number of Dubnium is 105.