40721

Names of 40721

• Cardinal: 40721 can be written as Forty thousand, seven hundred twenty-one.

Scientific notation

• Scientific notation: 4.0721 × 10⁴

Factors of 40721

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 990

Divisors of 40721

• Number of divisors d(n): 4
• Complete list of divisors:
  1 43 947 40721
• Sum of all divisors σ(n): 41712
• Sum of proper divisors (its aliquot sum) s(n): 991
• 40721 is a deficient number, because the sum of its proper divisors (991) is less than itself. Its deficiency is 39730

Bases of 40721

• Binary: 1001111100010001₂
• Hexadecimal: 0x9F11
• Base-36: VF5

Squares and roots of 40721

• 40721 squared (40721²) is 1658199841
• 40721 cubed (40721³) is 67523555725361
• The square root of 40721 is 201.7944498741
• The cube root of 40721 is 34.4037786547

Scales and comparisons

• 40,721 seconds is equal to 11 hours, 18 minutes, 41 seconds.
• To count from 1 to 40,721 would take you about eleven 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 40721 cubic inches would be around 2.9 feet tall.

Recreational maths with 40721

• 40721 backwards is 12704
• The number of decimal digits it has is: 5
• The sum of 40721's digits is 14
• More coming soon!