18991999

Names of 18991999

• Cardinal: 18991999 can be written as Eighteen million, nine hundred ninety-one thousand, nine hundred ninety-nine.

Scientific notation

• Scientific notation: 1.8991999 × 10⁷

Factors of 18991999

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1460936

Divisors of 18991999

• Number of divisors d(n): 4
• Complete list of divisors:
  1 13 1460923 18991999
• Sum of all divisors σ(n): 20452936
• Sum of proper divisors (its aliquot sum) s(n): 1460937
• 18991999 is a deficient number, because the sum of its proper divisors (1460937) is less than itself. Its deficiency is 17531062

Bases of 18991999

• Binary: 1001000011100101101111111₂
• Hexadecimal: 0x121CB7F
• Base-36: BB2BJ

Squares and roots of 18991999

• 18991999 squared (18991999²) is 360696026016001
• 18991999 cubed (18991999³) is 6850338565399864975999
• The square root of 18991999 is 4357.9810692567
• The cube root of 18991999 is 266.8027036807

Scales and comparisons

• 18,991,999 seconds is equal to 31 weeks, 2 days, 19 hours, 33 minutes, 19 seconds.
• To count from 1 to 18,991,999 would take you about forty-seven weeks!

  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 18991999 cubic inches would be around 22.2 feet tall.

Recreational maths with 18991999

• 18991999 backwards is 99919981
• The number of decimal digits it has is: 8
• The sum of 18991999's digits is 55
• More coming soon!