42991

Names of 42991

• Cardinal: 42991 can be written as Forty-two thousand, nine hundred ninety-one.

Scientific notation

• Scientific notation: 4.2991 × 10⁴

Factors of 42991

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 3320

Divisors of 42991

• Number of divisors d(n): 4
• Complete list of divisors:
  1 13 3307 42991
• Sum of all divisors σ(n): 46312
• Sum of proper divisors (its aliquot sum) s(n): 3321
• 42991 is a deficient number, because the sum of its proper divisors (3321) is less than itself. Its deficiency is 39670

Bases of 42991

• Binary: 1010011111101111₂
• Hexadecimal: 0xA7EF
• Base-36: X67

Squares and roots of 42991

• 42991 squared (42991²) is 1848226081
• 42991 cubed (42991³) is 79457087448271
• The square root of 42991 is 207.3427114709
• The cube root of 42991 is 35.0315362021

Scales and comparisons

• 42,991 seconds is equal to 11 hours, 56 minutes, 31 seconds.
• To count from 1 to 42,991 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 42991 cubic inches would be around 2.9 feet tall.

Recreational maths with 42991

• 42991 backwards is 19924
• The number of decimal digits it has is: 5
• The sum of 42991's digits is 25
• More coming soon!