21238740

Names of 21238740

• Cardinal: 21238740 can be written as Twenty-one million, two hundred thirty-eight thousand, seven hundred forty.

Scientific notation

• Scientific notation: 2.123874 × 10⁷

Factors of 21238740

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 1110

Divisors of 21238740

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 37 45 54 60 74 90 108 111 135 148 180 185 222 270 333 370 444 540 555 666 740 999 1063 1110 1332 1665 1998 2126 2220 3189 3330 3996 4252 4995 5315 6378 6660 9567 9990 10630 12756 15945 19134 19980 21260 28701 31890 38268 39331 47835 57402 63780 78662 95670 114804 117993 143505 157324 191340 196655 235986 287010 353979 393310 471972 574020 589965 707958 786620 1061937 1179930 1415916 1769895 2123874 2359860 3539790 4247748 5309685 7079580 10619370 21238740
• Sum of all divisors σ(n): 67925760
• Sum of proper divisors (its aliquot sum) s(n): 46687020
• 21238740 is an abundant number, because the sum of its proper divisors (46687020) is greater than itself. Its abundance is 25448280

Bases of 21238740

• Binary: 1010001000001001111010100₂
• Hexadecimal: 0x14413D4
• Base-36: CN7X0

Squares and roots of 21238740

• 21238740 squared (21238740²) is 451084076787600
• 21238740 cubed (21238740³) is 9580457425031871624000
• The square root of 21238740 is 4608.5507483373
• The cube root of 21238740 is 276.9339814083

Scales and comparisons

• 21,238,740 seconds is equal to 35 weeks, 19 hours, 39 minutes.
• To count from 1 to 21,238,740 would take you about four days!

  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 21238740 cubic inches would be around 23.1 feet tall.

Recreational maths with 21238740

• 21238740 backwards is 04783212
• 21238740 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21238740's digits is 27
• More coming soon!