21428742

Names of 21428742

• Cardinal: 21428742 can be written as Twenty-one million, four hundred twenty-eight thousand, seven hundred forty-two.

Scientific notation

• Scientific notation: 2.1428742 × 10⁷

Factors of 21428742

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 3571462

Divisors of 21428742

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 3 6 3571457 7142914 10714371 21428742
• Sum of all divisors σ(n): 42857496
• Sum of proper divisors (its aliquot sum) s(n): 21428754
• 21428742 is an abundant number, because the sum of its proper divisors (21428754) is greater than itself. Its abundance is 12

Bases of 21428742

• Binary: 1010001101111101000000110₂
• Hexadecimal: 0x146FA06
• Base-36: CRAIU

Squares and roots of 21428742

• 21428742 squared (21428742²) is 459190983702564
• 21428742 cubed (21428742³) is 9839885118488448694488
• The square root of 21428742 is 4629.1189226461
• The cube root of 21428742 is 277.7573491229

Scales and comparisons

• 21,428,742 seconds is equal to 35 weeks, 3 days, 25 minutes, 42 seconds.
• To count from 1 to 21,428,742 would take you about thirty-eight 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 21428742 cubic inches would be around 23.1 feet tall.

Recreational maths with 21428742

• 21428742 backwards is 24782412
• The number of decimal digits it has is: 8
• The sum of 21428742's digits is 30
• More coming soon!