1998561390

Names of 1998561390

• Cardinal: 1998561390 can be written as One billion, nine hundred ninety-eight million, five hundred sixty-one thousand, three hundred ninety.

Scientific notation

• Scientific notation: 1.99856139 × 10⁹

Factors of 1998561390

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 328217

Divisors of 1998561390

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 5 6 7 10 14 15 21 29 30 35 42 58 70 87 105 145 174 203 210 290 406 435 609 870 1015 1218 2030 3045 6090 328171 656342 984513 1640855 1969026 2297197 3281710 4594394 4922565 6891591 9516959 9845130 11485985 13783182 19033918 22971970 28550877 34457955 47584795 57101754 66618713 68915910 95169590 133237426 142754385 199856139 285508770 333093565 399712278 666187130 999280695 1998561390
• Sum of all divisors σ(n): 5670812160
• Sum of proper divisors (its aliquot sum) s(n): 3672250770
• 1998561390 is an abundant number, because the sum of its proper divisors (3672250770) is greater than itself. Its abundance is 1673689380

Bases of 1998561390

• Binary: 1110111000111111010000001101110₂
• Hexadecimal: 0x771FA06E
• Base-36: X1W3U6

Squares and roots of 1998561390

• 1998561390 squared (1998561390²) is 3994247629598732100
• 1998561390 cubed (1998561390³) is 7982749094615047168013619000
• The square root of 1998561390 is 44705.2725078373
• The cube root of 1998561390 is 1259.6188882643

Scales and comparisons

• 1,998,561,390 seconds is equal to 63 years, 28 weeks, 3 days, 11 hours, 56 minutes, 30 seconds.
• To count from 1 to 1,998,561,390 would take you about one hundred twenty-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 1998561390 cubic inches would be around 105 feet tall.

Recreational maths with 1998561390

• 1998561390 backwards is 0931658991
• The number of decimal digits it has is: 10
• The sum of 1998561390's digits is 51
• More coming soon!