129912990

Names of 129912990

• Cardinal: 129912990 can be written as One hundred twenty-nine million, nine hundred twelve thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 1.2991299 × 10⁸

Factors of 129912990

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 653

Divisors of 129912990

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 5 6 10 15 30 73 137 146 219 274 365 411 433 438 685 730 822 866 1095 1299 1370 2055 2165 2190 2598 4110 4330 6495 10001 12990 20002 30003 31609 50005 59321 60006 63218 94827 100010 118642 150015 158045 177963 189654 296605 300030 316090 355926 474135 593210 889815 948270 1779630 4330433 8660866 12991299 21652165 25982598 43304330 64956495 129912990
• Sum of all divisors σ(n): 319104576
• Sum of proper divisors (its aliquot sum) s(n): 189191586
• 129912990 is an abundant number, because the sum of its proper divisors (189191586) is greater than itself. Its abundance is 59278596

Bases of 129912990

• Binary: 111101111100101000010011110₂
• Hexadecimal: 0x7BE509E
• Base-36: 25CHI6

Squares and roots of 129912990

• 129912990 squared (129912990²) is 16877384970740100
• 129912990 cubed (129912990³) is 2192591544929908903899000
• The square root of 129912990 is 11397.9379714051
• The cube root of 129912990 is 506.4666574555

Scales and comparisons

• 129,912,990 seconds is equal to 4 years, 6 weeks, 5 days, 14 hours, 56 minutes, 30 seconds.
• To count from 1 to 129,912,990 would take you about six 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 129912990 cubic inches would be around 42.2 feet tall.

Recreational maths with 129912990

• 129912990 backwards is 099219921
• The number of decimal digits it has is: 9
• The sum of 129912990's digits is 42
• More coming soon!