138987420

Names of 138987420

• Cardinal: 138987420 can be written as One hundred thirty-eight million, nine hundred eighty-seven thousand, four hundred twenty.

Scientific notation

• Scientific notation: 1.3898742 × 10⁸

Factors of 138987420

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 298

Divisors of 138987420

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 10 11 12 13 15 20 22 26 30 33 39 44 52 55 60 65 66 78 97 110 130 132 143 156 165 167 194 195 220 260 286 291 330 334 388 390 429 485 501 572 582 660 668 715 780 835 858 970 1002 1067 1164 1261 1430 1455 1670 1716 1837 1940 2004 2134 2145 2171 2505 2522 2860 2910 3201 3340 3674 3783 4268 4290 4342 5010 5044 5335 5511 5820 6305 6402 6513 7348 7566 8580 8684 9185 10020 10670 10855 11022 12610 12804 13026 13871 15132 16005 16199 18370 18915 21340 21710 22044 23881 25220 26052 27555 27742 32010 32398 32565 36740 37830 41613 43420 47762 48597 55110 55484 64020 64796 65130 69355 71643 75660 80995 83226 95524 97194 110220 119405 130260 138710 143286 161990 166452 178189 194388 208065 210587 238810 242985 277420 286572 323980 356378 358215 416130 421174 477620 485970 534567 631761 712756 716430 832260 842348 890945 971940 1052935 1069134 1263522 1432860 1781890 2105870 2138268 2316457 2527044 2672835 3158805 3563780 4211740 4632914 5345670 6317610 6949371 9265828 10691340 11582285 12635220 13898742 23164570 27797484 34746855 46329140 69493710 138987420
• Sum of all divisors σ(n): 464679936
• Sum of proper divisors (its aliquot sum) s(n): 325692516
• 138987420 is an abundant number, because the sum of its proper divisors (325692516) is greater than itself. Its abundance is 186705096

Bases of 138987420

• Binary: 1000010010001100011110011100₂
• Hexadecimal: 0x848C79C
• Base-36: 2AQZDO

Squares and roots of 138987420

• 138987420 squared (138987420²) is 19317502918256400
• 138987420 cubed (138987420³) is 2684889891450927934488000
• The square root of 138987420 is 11789.2925996431
• The cube root of 138987420 is 517.9945190061

Scales and comparisons

• 138,987,420 seconds is equal to 4 years, 21 weeks, 5 days, 15 hours, 37 minutes.
• To count from 1 to 138,987,420 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 138987420 cubic inches would be around 43.2 feet tall.

Recreational maths with 138987420

• 138987420 backwards is 024789831
• The number of decimal digits it has is: 9
• The sum of 138987420's digits is 42
• More coming soon!