18161990

Names of 18161990

• Cardinal: 18161990 can be written as Eighteen million, one hundred sixty-one thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 1.816199 × 10⁷

Factors of 18161990

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 357

Divisors of 18161990

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 5 7 10 11 14 22 35 55 70 77 103 110 154 206 229 385 458 515 721 770 1030 1133 1145 1442 1603 2266 2290 2519 3206 3605 5038 5665 7210 7931 8015 11330 12595 15862 16030 17633 23587 25190 35266 39655 47174 79310 88165 117935 165109 176330 235870 259457 330218 518914 825545 1297285 1651090 1816199 2594570 3632398 9080995 18161990
• Sum of all divisors σ(n): 41333760
• Sum of proper divisors (its aliquot sum) s(n): 23171770
• 18161990 is an abundant number, because the sum of its proper divisors (23171770) is greater than itself. Its abundance is 5009780

Bases of 18161990

• Binary: 1000101010010000101000110₂
• Hexadecimal: 0x1152146
• Base-36: AT9VQ

Squares and roots of 18161990

• 18161990 squared (18161990²) is 329857880760100
• 18161990 cubed (18161990³) is 5990875531786128599000
• The square root of 18161990 is 4261.6886324555
• The cube root of 18161990 is 262.8579666517

Scales and comparisons

• 18,161,990 seconds is equal to 30 weeks, 4 hours, 59 minutes, 50 seconds.
• To count from 1 to 18,161,990 would take you about forty-five 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 18161990 cubic inches would be around 21.9 feet tall.

Recreational maths with 18161990

• 18161990 backwards is 09916181
• 18161990 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 18161990's digits is 35
• More coming soon!