1218728940

Names of 1218728940

• Cardinal: 1218728940 can be written as One billion, two hundred eighteen million, seven hundred twenty-eight thousand, nine hundred forty.

Scientific notation

• Scientific notation: 1.21872894 × 10⁹

Factors of 1218728940

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 420

Divisors of 1218728940

• Number of divisors d(n): 288
• Complete list of divisors:
  1 2 3 4 5 6 10 11 12 13 15 20 22 26 30 33 37 39 44 52 55 60 65 66 74 78 110 111 121 130 132 143 148 156 165 185 195 220 222 242 260 286 330 349 363 370 390 407 429 444 481 484 555 572 605 660 698 715 726 740 780 814 858 962 1047 1110 1210 1221 1396 1430 1443 1452 1573 1628 1716 1745 1815 1924 2035 2094 2145 2220 2405 2420 2442 2860 2886 3146 3490 3630 3839 4070 4188 4290 4477 4537 4719 4810 4884 5235 5291 5772 6105 6292 6980 7215 7260 7678 7865 8140 8580 8954 9074 9438 9620 10470 10582 11517 12210 12913 13431 13611 14430 15356 15730 15873 17908 18148 18876 19195 20940 21164 22385 22685 23034 23595 24420 25826 26455 26862 27222 28860 31460 31746 38390 38739 42229 44770 45370 46068 47190 49907 51652 52910 53724 54444 57585 58201 63492 64565 67155 68055 76780 77478 79365 84458 89540 90740 94380 99814 105820 115170 116402 126687 129130 134310 136110 142043 149721 154956 158730 167869 168916 174603 193695 199628 211145 230340 232804 249535 253374 258260 268620 272220 284086 291005 299442 317460 335738 349206 387390 422290 426129 499070 503607 506748 548977 568172 582010 598884 633435 671476 698412 710215 748605 774780 839345 844580 852258 873015 998140 1007214 1097954 1164020 1266870 1420430 1497210 1562473 1646931 1678690 1704516 1746030 1846559 2014428 2130645 2195908 2518035 2533740 2744885 2840860 2994420 3124946 3293862 3357380 3492060 3693118 4261290 4687419 5036070 5489770 5539677 6249892 6587724 7386236 7812365 8234655 8522580 9232795 9374838 10072140 10979540 11079354 15624730 16469310 18465590 18749676 20312149 22158708 23437095 27698385 31249460 32938620 36931180 40624298 46874190 55396770 60936447 81248596 93748380 101560745 110793540 121872894 203121490 243745788 304682235 406242980 609364470 1218728940
• Sum of all divisors σ(n): 4160452800
• Sum of proper divisors (its aliquot sum) s(n): 2941723860
• 1218728940 is an abundant number, because the sum of its proper divisors (2941723860) is greater than itself. Its abundance is 1722994920

Bases of 1218728940

• Binary: 1001000101001000101001111101100₂
• Hexadecimal: 0x48A453EC
• Base-36: K5LL9O

Squares and roots of 1218728940

• 1218728940 squared (1218728940²) is 1485300229193523600
• 1218728940 cubed (1218728940³) is 1810178373906780071892984000
• The square root of 1218728940 is 34910.2984805343
• The cube root of 1218728940 is 1068.1585177605

Scales and comparisons

• 1,218,728,940 seconds is equal to 38 years, 39 weeks, 15 hours, 49 minutes.
• To count from 1 to 1,218,728,940 would take you about seventy-seven years!

  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 1218728940 cubic inches would be around 89 feet tall.

Recreational maths with 1218728940

• 1218728940 backwards is 0498278121
• The number of decimal digits it has is: 10
• The sum of 1218728940's digits is 42
• More coming soon!