18639138

Names of 18639138

• Cardinal: 18639138 can be written as Eighteen million, six hundred thirty-nine thousand, one hundred thirty-eight.

Scientific notation

• Scientific notation: 1.8639138 × 10⁷

Factors of 18639138

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 3102

Divisors of 18639138

• Number of divisors d(n): 32
• Complete list of divisors:
  1 2 3 6 7 14 21 42 151 302 453 906 1057 2114 2939 3171 5878 6342 8817 17634 20573 41146 61719 123438 443789 887578 1331367 2662734 3106523 6213046 9319569 18639138
• Sum of all divisors σ(n): 42900480
• Sum of proper divisors (its aliquot sum) s(n): 24261342
• 18639138 is an abundant number, because the sum of its proper divisors (24261342) is greater than itself. Its abundance is 5622204

Bases of 18639138

• Binary: 1000111000110100100100010₂
• Hexadecimal: 0x11C6922
• Base-36: B3I1U

Squares and roots of 18639138

• 18639138 squared (18639138²) is 347417465383044
• 18639138 cubed (18639138³) is 6475562080884779976072
• The square root of 18639138 is 4317.3067993831
• The cube root of 18639138 is 265.1400138231

Scales and comparisons

• 18,639,138 seconds is equal to 30 weeks, 5 days, 17 hours, 32 minutes, 18 seconds.
• To count from 1 to 18,639,138 would take you about forty-six 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 18639138 cubic inches would be around 22.1 feet tall.

Recreational maths with 18639138

• 18639138 backwards is 83193681
• The number of decimal digits it has is: 8
• The sum of 18639138's digits is 39
• More coming soon!