18138978

Names of 18138978

• Cardinal: 18138978 can be written as Eighteen million, one hundred thirty-eight thousand, nine hundred seventy-eight.

Scientific notation

• Scientific notation: 1.8138978 × 10⁷

Factors of 18138978

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 58

Divisors of 18138978

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 6 9 11 13 18 22 26 27 29 33 39 54 58 66 78 81 87 99 117 143 162 174 198 234 243 261 286 297 319 351 377 429 486 522 594 638 702 729 754 783 858 891 957 1053 1131 1287 1458 1566 1782 1914 2106 2187 2262 2349 2574 2673 2871 3159 3393 3861 4147 4374 4698 5346 5742 6318 6786 7047 7722 8019 8294 8613 9477 10179 11583 12441 14094 16038 17226 18954 20358 21141 23166 24057 24882 25839 28431 30537 34749 37323 42282 48114 51678 56862 61074 63423 69498 74646 77517 91611 104247 111969 126846 155034 183222 208494 223938 232551 274833 312741 335907 465102 549666 625482 671814 697653 824499 1007721 1395306 1648998 2015442 3023163 6046326 9069489 18138978
• Sum of all divisors σ(n): 49593600
• Sum of proper divisors (its aliquot sum) s(n): 31454622
• 18138978 is an abundant number, because the sum of its proper divisors (31454622) is greater than itself. Its abundance is 13315644

Bases of 18138978

• Binary: 1000101001100011101100010₂
• Hexadecimal: 0x114C762
• Base-36: ASS4I

Squares and roots of 18138978

• 18138978 squared (18138978²) is 329022522884484
• 18138978 cubed (18138978³) is 5968132304106151817352
• The square root of 18138978 is 4258.9879079425
• The cube root of 18138978 is 262.7469023895

Scales and comparisons

• 18,138,978 seconds is equal to 29 weeks, 6 days, 22 hours, 36 minutes, 18 seconds.
• To count from 1 to 18,138,978 would take you about forty-four 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 18138978 cubic inches would be around 21.9 feet tall.

Recreational maths with 18138978

• 18138978 backwards is 87983181
• The number of decimal digits it has is: 8
• The sum of 18138978's digits is 45
• More coming soon!