209,209

7 × 11² × 13 × 19

Prime Factor Structure

Factorization String 7 × 11^2 × 13 × 19

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Total Divisors 24

Divisor Sum (σ) 297,920

Proper Divisor Sum 88,711

Digit Sum / Digital Root 22 (Root: 4)

Adjacent Primes #209203 ← → #209213

1 7 11 13 19 77 91 121 133 143 209 247 847 1,001 1,463 1,573 1,729 2,299 2,717 11,011 16,093 19,019 29,887 209,209

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

209,209 627,628 313,814 156,907 470,722 235,361 706,084 353,042 176,521 529,564 264,782 132,391 397,174 198,587 595,762 297,881 893,644 446,822 223,411 670,234 335,117 1,005,352 502,676 251,338 125,669 377,008 188,504 94,252 47,126 23,563 70,690 35,345 106,036 53,018 26,509 79,528 39,764 19,882 9,941 29,824 14,912 7,456 3,728 1,864 932 466 233 700 350 175 526 263 790 395 1,186 593 1,780 890 445 1,336

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