390

Names of 390

• Cardinal: 390 can be written as Three hundred ninety.

Scientific notation

• Scientific notation: 3.9 × 10²

Factors of 390

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 23

Divisors of 390

• Number of divisors d(n): 16
• Complete list of divisors:
  1 2 3 5 6 10 13 15 26 30 39 65 78 130 195 390
• Sum of all divisors σ(n): 1008
• Sum of proper divisors (its aliquot sum) s(n): 618
• 390 is an abundant number, because the sum of its proper divisors (618) is greater than itself. Its abundance is 228

Bases of 390

• Binary: 110000110₂
• Hexadecimal: 0x186
• Base-36: AU

Squares and roots of 390

• 390 squared (390²) is 152100
• 390 cubed (390³) is 59319000
• The square root of 390 is 19.7484176581
• The cube root of 390 is 7.3061435743

Scales and comparisons

• 390 seconds is equal to 6 minutes, 30 seconds.
• To count from 1 to 390 would take you about three minutes.

  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 390 cubic inches would be around 0.6 feet tall.

Recreational maths with 390

• 390 backwards is 093
• The number of decimal digits it has is: 3
• The sum of 390's digits is 12
• More coming soon!