7940

Names of 7940

• Cardinal: 7940 can be written as Seven thousand, nine hundred forty.

Scientific notation

• Scientific notation: 7.94 × 10³

Factors of 7940

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 404

Divisors of 7940

• Number of divisors d(n): 12
• Complete list of divisors:
  1 2 4 5 10 20 397 794 1588 1985 3970 7940
• Sum of all divisors σ(n): 16716
• Sum of proper divisors (its aliquot sum) s(n): 8776
• 7940 is an abundant number, because the sum of its proper divisors (8776) is greater than itself. Its abundance is 836

Bases of 7940

• Binary: 1111100000100₂
• Hexadecimal: 0x1F04
• Base-36: 64K

Squares and roots of 7940

• 7940 squared (7940²) is 63043600
• 7940 cubed (7940³) is 500566184000
• The square root of 7940 is 89.1066776397
• The cube root of 7940 is 19.9498744765

Scales and comparisons

• 7,940 seconds is equal to 2 hours, 12 minutes, 20 seconds.
• To count from 1 to 7,940 would take you about two 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 7940 cubic inches would be around 1.7 feet tall.

Recreational maths with 7940

• 7940 backwards is 0497
• 7940 is a Harshad number.
• The number of decimal digits it has is: 4
• The sum of 7940's digits is 20
• More coming soon!