1218131390

Names of 1218131390

• Cardinal: 1218131390 can be written as One billion, two hundred eighteen million, one hundred thirty-one thousand, three hundred ninety.

Scientific notation

• Scientific notation: 1.21813139 × 10⁹

Factors of 1218131390

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 3621

Divisors of 1218131390

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 5 7 10 14 35 37 70 74 137 185 259 274 370 518 685 959 1295 1370 1918 2590 3433 4795 5069 6866 9590 10138 17165 24031 25345 34330 35483 48062 50690 70966 120155 127021 177415 240310 254042 354830 470321 635105 889147 940642 1270210 1778294 2351605 3292247 4445735 4703210 6584494 8891470 16461235 17401877 32922470 34803754 87009385 121813139 174018770 243626278 609065695 1218131390
• Sum of all divisors σ(n): 2593137024
• Sum of proper divisors (its aliquot sum) s(n): 1375005634
• 1218131390 is an abundant number, because the sum of its proper divisors (1375005634) is greater than itself. Its abundance is 156874244

Bases of 1218131390

• Binary: 1001000100110110011010110111110₂
• Hexadecimal: 0x489B35BE
• Base-36: K58S72

Squares and roots of 1218131390

• 1218131390 squared (1218131390²) is 1483844083303332100
• 1218131390 cubed (1218131390³) is 1807517055737563722604619000
• The square root of 1218131390 is 34901.7390684191
• The cube root of 1218131390 is 1067.9839144103

Scales and comparisons

• 1,218,131,390 seconds is equal to 38 years, 38 weeks, 17 hours, 49 minutes, 50 seconds.
• To count from 1 to 1,218,131,390 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 1218131390 cubic inches would be around 89 feet tall.

Recreational maths with 1218131390

• 1218131390 backwards is 0931318121
• The number of decimal digits it has is: 10
• The sum of 1218131390's digits is 29
• More coming soon!