18999900

Names of 18999900

• Cardinal: 18999900 can be written as Eighteen million, nine hundred ninety-nine thousand, nine hundred.

Scientific notation

• Scientific notation: 1.89999 × 10⁷

Factors of 18999900

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 268

Divisors of 18999900

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 25 27 30 31 36 45 50 54 60 62 75 90 93 100 108 124 135 150 155 180 186 225 227 270 279 300 310 372 450 454 465 540 558 620 675 681 775 837 900 908 930 1116 1135 1350 1362 1395 1550 1674 1860 2043 2270 2325 2700 2724 2790 3100 3348 3405 4086 4185 4540 4650 5580 5675 6129 6810 6975 7037 8172 8370 9300 10215 11350 12258 13620 13950 14074 16740 17025 20430 20925 21111 22700 24516 27900 28148 30645 34050 35185 40860 41850 42222 51075 61290 63333 68100 70370 83700 84444 102150 105555 122580 126666 140740 153225 175925 189999 204300 211110 253332 306450 316665 351850 379998 422220 527775 612900 633330 703700 759996 949995 1055550 1266660 1583325 1899990 2111100 3166650 3799980 4749975 6333300 9499950 18999900
• Sum of all divisors σ(n): 63329280
• Sum of proper divisors (its aliquot sum) s(n): 44329380
• 18999900 is an abundant number, because the sum of its proper divisors (44329380) is greater than itself. Its abundance is 25329480

Bases of 18999900

• Binary: 1001000011110101001011100₂
• Hexadecimal: 0x121EA5C
• Base-36: BB8F0

Squares and roots of 18999900

• 18999900 squared (18999900²) is 360996200010000
• 18999900 cubed (18999900³) is 6858891700569999000000
• The square root of 18999900 is 4358.8874727389
• The cube root of 18999900 is 266.8396967307

Scales and comparisons

• 18,999,900 seconds is equal to 31 weeks, 2 days, 21 hours, 45 minutes.
• To count from 1 to 18,999,900 would take you about forty-seven 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 18999900 cubic inches would be around 22.2 feet tall.

Recreational maths with 18999900

• 18999900 backwards is 00999981
• 18999900 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 18999900's digits is 45
• More coming soon!