13721

Names of 13721

• Cardinal: 13721 can be written as Thirteen thousand, seven hundred twenty-one.

Scientific notation

• Scientific notation: 1.3721 × 10⁴

Factors of 13721

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 13721

Divisors of 13721

• Number of divisors d(n): 2
• Complete list of divisors:
  1 13721
• Sum of all divisors σ(n): 13722
• Sum of proper divisors (its aliquot sum) s(n): 1
• 13721 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 13720

Bases of 13721

• Binary: 11010110011001₂
• Hexadecimal: 0x3599
• Base-36: AL5

Squares and roots of 13721

• 13721 squared (13721²) is 188265841
• 13721 cubed (13721³) is 2583195604361
• The square root of 13721 is 117.1366723105
• The cube root of 13721 is 23.9402448639

Scales and comparisons

• 13,721 seconds is equal to 3 hours, 48 minutes, 41 seconds.
• To count from 1 to 13,721 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 13721 cubic inches would be around 2 feet tall.

Recreational maths with 13721

• 13721 backwards is 12731
• 13721 is a twin prime! Its twin is 13723
• The number of decimal digits it has is: 5
• The sum of 13721's digits is 14
• More coming soon!