138238920

Names of 138238920

• Cardinal: 138238920 can be written as One hundred thirty-eight million, two hundred thirty-eight thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 1.3823892 × 10⁸

Factors of 138238920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 4170

Divisors of 138238920

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 31 36 40 45 54 60 62 72 90 93 108 120 124 135 155 180 186 216 248 270 279 310 360 372 465 540 558 620 744 837 930 1080 1116 1240 1395 1674 1860 2232 2790 3348 3720 4129 4185 5580 6696 8258 8370 11160 12387 16516 16740 20645 24774 33032 33480 37161 41290 49548 61935 74322 82580 99096 111483 123870 127999 148644 165160 185805 222966 247740 255998 297288 371610 383997 445932 495480 511996 557415 639995 743220 767994 891864 1023992 1114830 1151991 1279990 1486440 1535988 1919985 2229660 2303982 2559980 3071976 3455973 3839970 4459320 4607964 5119960 5759955 6911946 7679940 9215928 11519910 13823892 15359880 17279865 23039820 27647784 34559730 46079640 69119460 138238920
• Sum of all divisors σ(n): 475776000
• Sum of proper divisors (its aliquot sum) s(n): 337537080
• 138238920 is an abundant number, because the sum of its proper divisors (337537080) is greater than itself. Its abundance is 199298160

Bases of 138238920

• Binary: 1000001111010101101111001000₂
• Hexadecimal: 0x83D5BC8
• Base-36: 2AAXU0

Squares and roots of 138238920

• 138238920 squared (138238920²) is 19109999002766400
• 138238920 cubed (138238920³) is 2641745623343504148288000
• The square root of 138238920 is 11757.5048373369
• The cube root of 138238920 is 517.0629790825

Scales and comparisons

• 138,238,920 seconds is equal to 4 years, 20 weeks, 3 days, 23 hours, 42 minutes.
• To count from 1 to 138,238,920 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 138238920 cubic inches would be around 43.1 feet tall.

Recreational maths with 138238920

• 138238920 backwards is 029832831
• 138238920 is a Harshad number.
• The number of decimal digits it has is: 9
• The sum of 138238920's digits is 36
• More coming soon!