3990

Names of 3990

• Cardinal: 3990 can be written as Three thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 3.99 × 10³

Factors of 3990

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 36

Divisors of 3990

• Number of divisors d(n): 32
• Complete list of divisors:
  1 2 3 5 6 7 10 14 15 19 21 30 35 38 42 57 70 95 105 114 133 190 210 266 285 399 570 665 798 1330 1995 3990
• Sum of all divisors σ(n): 11520
• Sum of proper divisors (its aliquot sum) s(n): 7530
• 3990 is an abundant number, because the sum of its proper divisors (7530) is greater than itself. Its abundance is 3540

Bases of 3990

• Binary: 111110010110₂
• Hexadecimal: 0xF96
• Base-36: 32U

Squares and roots of 3990

• 3990 squared (3990²) is 15920100
• 3990 cubed (3990³) is 63521199000
• The square root of 3990 is 63.1664467895
• The cube root of 3990 is 15.8607711387

Scales and comparisons

• 3,990 seconds is equal to 1 hour, 6 minutes, 30 seconds.
• To count from 1 to 3,990 would take you about six minutes.

  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 3990 cubic inches would be around 1.3 feet tall.

Recreational maths with 3990

• 3990 backwards is 0993
• 3990 is a Harshad number.
• The number of decimal digits it has is: 4
• The sum of 3990's digits is 21
• More coming soon!