721,287

3² × 7 × 107²

Prime Factor Structure

Factorization String 3^2 × 7 × 107^2

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 18

Divisor Sum (σ) 1,201,928

Proper Divisor Sum 480,641

Digit Sum / Digital Root 27 (Root: 9)

Adjacent Primes #721283 ← → #721291

1 3 7 9 21 63 107 321 749 963 2,247 6,741 11,449 34,347 80,143 103,041 240,429 721,287

Iterative sequence n → n/2 (if even) or 3n+1 (if odd):

721,287 2,163,862 1,081,931 3,245,794 1,622,897 4,868,692 2,434,346 1,217,173 3,651,520 1,825,760 912,880 456,440 228,220 114,110 57,055 171,166 85,583 256,750 128,375 385,126 192,563 577,690 288,845 866,536 433,268 216,634 108,317 324,952 162,476 81,238 40,619 121,858 60,929 182,788 91,394 45,697 137,092 68,546 34,273 102,820 51,410 25,705 77,116 38,558 19,279 57,838 28,919 86,758 43,379 130,138 65,069 195,208 97,604 48,802 24,401 73,204 36,602 18,301 54,904 27,452

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