138991831

Names of 138991831

• Cardinal: 138991831 can be written as One hundred thirty-eight million, nine hundred ninety-one thousand, eight hundred thirty-one.

Scientific notation

• Scientific notation: 1.38991831 × 10⁸

Factors of 138991831

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 268901

Divisors of 138991831

• Number of divisors d(n): 8
• Complete list of divisors:
  1 11 47 517 268843 2957273 12635621 138991831
• Sum of all divisors σ(n): 154854144
• Sum of proper divisors (its aliquot sum) s(n): 15862313
• 138991831 is a deficient number, because the sum of its proper divisors (15862313) is less than itself. Its deficiency is 123129518

Bases of 138991831

• Binary: 1000010010001101100011010111₂
• Hexadecimal: 0x848D8D7
• Base-36: 2AR2S7

Squares and roots of 138991831

• 138991831 squared (138991831²) is 19318729084732561
• 138991831 cubed (138991831³) is 2685145528079932798709191
• The square root of 138991831 is 11789.4796746931
• The cube root of 138991831 is 517.9999987577

Scales and comparisons

• 138,991,831 seconds is equal to 4 years, 21 weeks, 5 days, 16 hours, 50 minutes, 31 seconds.
• To count from 1 to 138,991,831 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 138991831 cubic inches would be around 43.2 feet tall.

Recreational maths with 138991831

• 138991831 backwards is 138199831
• The number of decimal digits it has is: 9
• The sum of 138991831's digits is 43
• More coming soon!