809

Names of 809

• Cardinal: 809 can be written as Eight hundred nine.

Scientific notation

• Scientific notation: 8.09 × 10²

Factors of 809

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 809

Divisors of 809

• Number of divisors d(n): 2
• Complete list of divisors:
  1 809
• Sum of all divisors σ(n): 810
• Sum of proper divisors (its aliquot sum) s(n): 1
• 809 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 808

Bases of 809

• Binary: 1100101001₂
• Hexadecimal: 0x329
• Base-36: MH

Squares and roots of 809

• 809 squared (809²) is 654481
• 809 cubed (809³) is 529475129
• The square root of 809 is 28.4429253067
• The cube root of 809 is 9.3178598485

Scales and comparisons

• 809 seconds is equal to 13 minutes, 29 seconds.
• To count from 1 to 809 would take you about six 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 809 cubic inches would be around 0.8 feet tall.

Recreational maths with 809

• 809 backwards is 908
• 809 is a twin prime! Its twin is 811
• The number of decimal digits it has is: 3
• The sum of 809's digits is 17
• More coming soon!