21638

Names of 21638

• Cardinal: 21638 can be written as Twenty-one thousand, six hundred thirty-eight.

Scientific notation

• Scientific notation: 2.1638 × 10⁴

Factors of 21638

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 382

Divisors of 21638

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 31 62 349 698 10819 21638
• Sum of all divisors σ(n): 33600
• Sum of proper divisors (its aliquot sum) s(n): 11962
• 21638 is a deficient number, because the sum of its proper divisors (11962) is less than itself. Its deficiency is 9676

Bases of 21638

• Binary: 101010010000110₂
• Hexadecimal: 0x5486
• Base-36: GP2

Squares and roots of 21638

• 21638 squared (21638²) is 468203044
• 21638 cubed (21638³) is 10130977466072
• The square root of 21638 is 147.0986063837
• The cube root of 21638 is 27.8658549501

Scales and comparisons

• 21,638 seconds is equal to 6 hours, 38 seconds.
• To count from 1 to 21,638 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 21638 cubic inches would be around 2.3 feet tall.

Recreational maths with 21638

• 21638 backwards is 83612
• The number of decimal digits it has is: 5
• The sum of 21638's digits is 20
• More coming soon!