21399840

Names of 21399840

• Cardinal: 21399840 can be written as Twenty-one million, three hundred ninety-nine thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.139984 × 10⁷

Factors of 21399840

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 221

Divisors of 21399840

• Number of divisors d(n): 288
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 18 20 21 22 24 28 30 32 33 35 36 40 42 44 45 48 55 56 60 63 66 70 72 77 80 84 88 90 96 99 105 110 112 120 126 132 140 144 154 160 165 168 176 180 193 198 210 220 224 231 240 252 264 280 288 308 315 330 336 352 360 385 386 396 420 440 462 480 495 504 528 560 579 616 630 660 672 693 720 770 772 792 840 880 924 965 990 1008 1056 1120 1155 1158 1232 1260 1320 1351 1386 1440 1540 1544 1584 1680 1737 1760 1848 1930 1980 2016 2123 2310 2316 2464 2520 2640 2702 2772 2895 3080 3088 3168 3360 3465 3474 3696 3860 3960 4053 4246 4620 4632 5040 5280 5404 5544 5790 6160 6176 6369 6755 6930 6948 7392 7720 7920 8106 8492 8685 9240 9264 10080 10615 10808 11088 11580 12159 12320 12738 13510 13860 13896 14861 15440 15840 16212 16984 17370 18480 18528 19107 20265 21230 21616 22176 23160 24318 25476 27020 27720 27792 29722 30880 31845 32424 33968 34740 36960 38214 40530 42460 43232 44583 46320 48636 50952 54040 55440 55584 59444 60795 63690 64848 67936 69480 74305 76428 81060 84920 89166 92640 95535 97272 101904 108080 110880 118888 121590 127380 129696 133749 138960 148610 152856 162120 169840 178332 191070 194544 203808 216160 222915 237776 243180 254760 267498 277920 297220 305712 324240 339680 356664 382140 389088 445830 475552 486360 509520 534996 594440 611424 648480 668745 713328 764280 891660 972720 1019040 1069992 1188880 1337490 1426656 1528560 1783320 1945440 2139984 2377760 2674980 3057120 3566640 4279968 5349960 7133280 10699920 21399840
• Sum of all divisors σ(n): 91518336
• Sum of proper divisors (its aliquot sum) s(n): 70118496
• 21399840 is an abundant number, because the sum of its proper divisors (70118496) is greater than itself. Its abundance is 48718656

Bases of 21399840

• Binary: 1010001101000100100100000₂
• Hexadecimal: 0x1468920
• Base-36: CQO80

Squares and roots of 21399840

• 21399840 squared (21399840²) is 457953152025600
• 21399840 cubed (21399840³) is 9800124180843515904000
• The square root of 21399840 is 4625.9961089477
• The cube root of 21399840 is 277.6324179325

Scales and comparisons

• 21,399,840 seconds is equal to 35 weeks, 2 days, 16 hours, 24 minutes.
• To count from 1 to 21,399,840 would take you about twelve 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 21399840 cubic inches would be around 23.1 feet tall.

Recreational maths with 21399840

• 21399840 backwards is 04899312
• 21399840 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21399840's digits is 36
• More coming soon!