400000000

Names of 400000000

• Cardinal: 400000000 can be written as Four hundred million.

Scientific notation

• Scientific notation: 4 × 10⁸

Factors of 400000000

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 18
• Sum of prime factors: 7

Divisors of 400000000

• Number of divisors d(n): 99
• Complete list of divisors:
  1 2 4 5 8 10 16 20 25 32 40 50 64 80 100 125 128 160 200 250 256 320 400 500 512 625 640 800 1000 1024 1250 1280 1600 2000 2500 2560 3125 3200 4000 5000 5120 6250 6400 8000 10000 12500 12800 15625 16000 20000 25000 25600 31250 32000 40000 50000 62500 64000 78125 80000 100000 125000 128000 156250 160000 200000 250000 312500 320000 390625 400000 500000 625000 640000 781250 800000 1000000 1250000 1562500 1600000 2000000 2500000 3125000 3200000 4000000 5000000 6250000 8000000 10000000 12500000 16000000 20000000 25000000 40000000 50000000 80000000 100000000 200000000 400000000
• Sum of all divisors σ(n): 999511207
• Sum of proper divisors (its aliquot sum) s(n): 599511207
• 400000000 is an abundant number, because the sum of its proper divisors (599511207) is greater than itself. Its abundance is 199511207

Bases of 400000000

• Binary: 10111110101111000010000000000₂
• Hexadecimal: 0x17D78400
• Base-36: 6M5DZ4

Squares and roots of 400000000

• 400000000 squared (400000000²) is 160000000000000000
• 400000000 cubed (400000000³) is 64000000000000000000000000
• 400000000 is a perfect square number. Its square root is 20000
• The cube root of 400000000 is 736.8062997281

Scales and comparisons

• 400,000,000 seconds is equal to 12 years, 37 weeks, 2 days, 15 hours, 6 minutes, 40 seconds.
• To count from 1 to 400,000,000 would take you about nineteen 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 400000000 cubic inches would be around 61.4 feet tall.

Recreational maths with 400000000

• 400000000 backwards is 000000004
• 400000000 is a Harshad number.
• The number of decimal digits it has is: 9
• The sum of 400000000's digits is 4
• More coming soon!