1805

Names of 1805

• Cardinal: 1805 can be written as One thousand, eight hundred five.

Scientific notation

• Scientific notation: 1.805 × 10³

Factors of 1805

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 24

Divisors of 1805

• Number of divisors d(n): 6
• Complete list of divisors:
  1 5 19 95 361 1805
• Sum of all divisors σ(n): 2286
• Sum of proper divisors (its aliquot sum) s(n): 481
• 1805 is a deficient number, because the sum of its proper divisors (481) is less than itself. Its deficiency is 1324

Bases of 1805

• Binary: 11100001101₂
• Hexadecimal: 0x70D
• Base-36: 1E5

Squares and roots of 1805

• 1805 squared (1805²) is 3258025
• 1805 cubed (1805³) is 5880735125
• The square root of 1805 is 42.4852915725
• The cube root of 1805 is 12.1756569153

Scales and comparisons

• 1,805 seconds is equal to 30 minutes, 5 seconds.
• To count from 1 to 1,805 would take you about thirty minutes.

  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 1805 cubic inches would be around 1 feet tall.

Recreational maths with 1805

• 1805 backwards is 5081
• The number of decimal digits it has is: 4
• The sum of 1805's digits is 14
• More coming soon!