21890

Names of 21890

• Cardinal: 21890 can be written as Twenty-one thousand, eight hundred ninety.

Scientific notation

• Scientific notation: 2.189 × 10⁴

Factors of 21890

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 217

Divisors of 21890

• Number of divisors d(n): 16
• Complete list of divisors:
  1 2 5 10 11 22 55 110 199 398 995 1990 2189 4378 10945 21890
• Sum of all divisors σ(n): 43200
• Sum of proper divisors (its aliquot sum) s(n): 21310
• 21890 is a deficient number, because the sum of its proper divisors (21310) is less than itself. Its deficiency is 580

Bases of 21890

• Binary: 101010110000010₂
• Hexadecimal: 0x5582
• Base-36: GW2

Squares and roots of 21890

• 21890 squared (21890²) is 479172100
• 21890 cubed (21890³) is 10489077269000
• The square root of 21890 is 147.9526951427
• The cube root of 21890 is 27.9736145997

Scales and comparisons

• 21,890 seconds is equal to 6 hours, 4 minutes, 50 seconds.
• To count from 1 to 21,890 would take you about six 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 21890 cubic inches would be around 2.3 feet tall.

Recreational maths with 21890

• 21890 backwards is 09812
• The number of decimal digits it has is: 5
• The sum of 21890's digits is 20
• More coming soon!