21403440

Names of 21403440

• Cardinal: 21403440 can be written as Twenty-one million, four hundred three thousand, four hundred forty.

Scientific notation

• Scientific notation: 2.140344 × 10⁷

Factors of 21403440

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 377

Divisors of 21403440

• Number of divisors d(n): 140
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 36 40 45 48 54 60 72 80 81 90 108 120 135 144 162 180 216 240 243 270 324 360 367 405 432 486 540 648 720 729 734 810 972 1080 1101 1215 1296 1458 1468 1620 1835 1944 2160 2202 2430 2916 2936 3240 3303 3645 3670 3888 4404 4860 5505 5832 5872 6480 6606 7290 7340 8808 9720 9909 11010 11664 13212 14580 14680 16515 17616 19440 19818 22020 26424 29160 29360 29727 33030 39636 44040 49545 52848 58320 59454 66060 79272 88080 89181 99090 118908 132120 148635 158544 178362 198180 237816 264240 267543 297270 356724 396360 445905 475632 535086 594540 713448 792720 891810 1070172 1189080 1337715 1426896 1783620 2140344 2378160 2675430 3567240 4280688 5350860 7134480 10701720 21403440
• Sum of all divisors σ(n): 74813664
• Sum of proper divisors (its aliquot sum) s(n): 53410224
• 21403440 is an abundant number, because the sum of its proper divisors (53410224) is greater than itself. Its abundance is 32006784

Bases of 21403440

• Binary: 1010001101001011100110000₂
• Hexadecimal: 0x1469730
• Base-36: CQR00

Squares and roots of 21403440

• 21403440 squared (21403440²) is 458107243833600
• 21403440 cubed (21403440³) is 9805070906957827584000
• The square root of 21403440 is 4626.3851979705
• The cube root of 21403440 is 277.6479853489

Scales and comparisons

• 21,403,440 seconds is equal to 35 weeks, 2 days, 17 hours, 24 minutes.
• To count from 1 to 21,403,440 would take you about fourteen 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 21403440 cubic inches would be around 23.1 feet tall.

Recreational maths with 21403440

• 21403440 backwards is 04430412
• 21403440 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21403440's digits is 18
• More coming soon!