12805

Names of 12805

• Cardinal: 12805 can be written as Twelve thousand, eight hundred five.

Scientific notation

• Scientific notation: 1.2805 × 10⁴

Factors of 12805

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 215

Divisors of 12805

• Number of divisors d(n): 8
• Complete list of divisors:
  1 5 13 65 197 985 2561 12805
• Sum of all divisors σ(n): 16632
• Sum of proper divisors (its aliquot sum) s(n): 3827
• 12805 is a deficient number, because the sum of its proper divisors (3827) is less than itself. Its deficiency is 8978

Bases of 12805

• Binary: 11001000000101₂
• Hexadecimal: 0x3205
• Base-36: 9VP

Squares and roots of 12805

• 12805 squared (12805²) is 163968025
• 12805 cubed (12805³) is 2099610560125
• The square root of 12805 is 113.1591799193
• The cube root of 12805 is 23.3951873611

Scales and comparisons

• 12,805 seconds is equal to 3 hours, 33 minutes, 25 seconds.
• To count from 1 to 12,805 would take you about three hours.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 12805 cubic inches would be around 1.9 feet tall.

Recreational maths with 12805

• 12805 backwards is 50821
• The number of decimal digits it has is: 5
• The sum of 12805's digits is 16
• More coming soon!