18945990

Names of 18945990

• Cardinal: 18945990 can be written as Eighteen million, nine hundred forty-five thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 1.894599 × 10⁷

Factors of 18945990

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 124

Divisors of 18945990

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 5 6 7 9 10 14 15 17 18 21 29 30 34 35 42 45 51 58 61 63 70 85 87 90 102 105 119 122 126 145 153 170 174 183 203 210 238 255 261 290 305 306 315 357 366 406 427 435 493 510 522 549 595 609 610 630 714 765 854 870 915 986 1015 1037 1071 1098 1190 1218 1281 1305 1479 1530 1769 1785 1827 1830 2030 2074 2135 2142 2465 2562 2610 2745 2958 3045 3111 3451 3538 3570 3654 3843 4270 4437 4930 5185 5307 5355 5490 6090 6222 6405 6902 7259 7395 7686 8845 8874 9135 9333 10353 10370 10614 10710 12383 12810 14518 14790 15555 15921 17255 17690 18270 18666 19215 20706 21777 22185 24766 26535 30073 31059 31110 31842 34510 36295 37149 38430 43554 44370 46665 51765 53070 60146 61915 62118 65331 72590 74298 79605 90219 93330 103530 108885 111447 123830 130662 150365 155295 159210 180438 185745 210511 217770 222894 270657 300730 310590 326655 371490 421022 451095 541314 557235 631533 653310 902190 1052555 1114470 1263066 1353285 1894599 2105110 2706570 3157665 3789198 6315330 9472995 18945990
• Sum of all divisors σ(n): 62674560
• Sum of proper divisors (its aliquot sum) s(n): 43728570
• 18945990 is an abundant number, because the sum of its proper divisors (43728570) is greater than itself. Its abundance is 24782580

Bases of 18945990

• Binary: 1001000010001011111000110₂
• Hexadecimal: 0x12117C6
• Base-36: BA2TI

Squares and roots of 18945990

• 18945990 squared (18945990²) is 358950537080100
• 18945990 cubed (18945990³) is 6800673286014203799000
• The square root of 18945990 is 4352.6991625887
• The cube root of 18945990 is 266.5870821537

Scales and comparisons

• 18,945,990 seconds is equal to 31 weeks, 2 days, 6 hours, 46 minutes, 30 seconds.
• To count from 1 to 18,945,990 would take you about forty-six weeks!

  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 18945990 cubic inches would be around 22.2 feet tall.

Recreational maths with 18945990

• 18945990 backwards is 09954981
• 18945990 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 18945990's digits is 45
• More coming soon!