1388391921

Names of 1388391921

• Cardinal: 1388391921 can be written as One billion, three hundred eighty-eight million, three hundred ninety-one thousand, nine hundred twenty-one.

Scientific notation

• Scientific notation: 1.388391921 × 10⁹

Factors of 1388391921

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 46

Divisors of 1388391921

• Number of divisors d(n): 144
• Complete list of divisors:
  1 3 7 9 17 19 21 27 49 51 57 63 81 119 133 147 153 171 189 243 323 357 361 399 441 459 513 567 833 931 969 1071 1083 1197 1323 1377 1539 1701 2261 2499 2527 2793 2907 3213 3249 3591 3969 4131 4617 6137 6783 6859 7497 7581 8379 8721 9639 9747 10773 11907 15827 17689 18411 20349 20577 22491 22743 25137 26163 28917 29241 32319 42959 47481 48013 53067 55233 61047 61731 67473 68229 75411 78489 87723 116603 128877 142443 144039 159201 165699 183141 185193 202419 204687 226233 300713 336091 349809 386631 427329 432117 477603 497097 549423 555579 614061 816221 902139 1008273 1049427 1159893 1281987 1296351 1432809 1491291 1666737 2448663 2706417 3024819 3148281 3479679 3845961 3889053 4298427 5713547 7345989 8119251 9074457 9444843 10439037 11667159 17140641 22037967 24357753 27223371 28334529 51421923 66113901 73073259 81670113 154265769 198341703 462797307 1388391921
• Sum of all divisors σ(n): 2703879360
• Sum of proper divisors (its aliquot sum) s(n): 1315487439
• 1388391921 is a deficient number, because the sum of its proper divisors (1315487439) is less than itself. Its deficiency is 72904482

Bases of 1388391921

• Binary: 1010010110000010010110111110001₂
• Hexadecimal: 0x52C12DF1
• Base-36: MYM229

Squares and roots of 1388391921

• 1388391921 squared (1388391921²) is 1927632126298070241
• 1388391921 cubed (1388391921³) is 2676308870812292360494922961
• The square root of 1388391921 is 37261.1315045585
• The cube root of 1388391921 is 1115.5884929231

Scales and comparisons

• 1,388,391,921 seconds is equal to 44 years, 7 weeks, 4 days, 8 hours, 25 minutes, 21 seconds.
• To count from 1 to 1,388,391,921 would take you about eighty-eight 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 1388391921 cubic inches would be around 93 feet tall.

Recreational maths with 1388391921

• 1388391921 backwards is 1291938831
• The number of decimal digits it has is: 10
• The sum of 1388391921's digits is 45
• More coming soon!