21908

Names of 21908

• Cardinal: 21908 can be written as Twenty-one thousand, nine hundred eight.

Scientific notation

• Scientific notation: 2.1908 × 10⁴

Factors of 21908

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 5479

Divisors of 21908

• Number of divisors d(n): 6
• Complete list of divisors:
  1 2 4 5477 10954 21908
• Sum of all divisors σ(n): 38346
• Sum of proper divisors (its aliquot sum) s(n): 16438
• 21908 is a deficient number, because the sum of its proper divisors (16438) is less than itself. Its deficiency is 5470

Bases of 21908

• Binary: 101010110010100₂
• Hexadecimal: 0x5594
• Base-36: GWK

Squares and roots of 21908

• 21908 squared (21908²) is 479960464
• 21908 cubed (21908³) is 10514973845312
• The square root of 21908 is 148.0135128967
• The cube root of 21908 is 27.9812800041

Scales and comparisons

• 21,908 seconds is equal to 6 hours, 5 minutes, 8 seconds.
• To count from 1 to 21,908 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 21908 cubic inches would be around 2.3 feet tall.

Recreational maths with 21908

• 21908 backwards is 80912
• The number of decimal digits it has is: 5
• The sum of 21908's digits is 20
• More coming soon!