13² × 17 × 223

Prime Factor Structure

Factorization String 13^2 × 17 × 223

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 12

Divisor Sum (σ) 737,856

Proper Divisor Sum 97,177

Digit Sum / Digital Root 32 (Root: 5)

Adjacent Primes #640669 ← → #640687

1 13 17 169 221 223 2,873 2,899 3,791 37,687 49,283 640,679

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

640,679 1,922,038 961,019 2,883,058 1,441,529 4,324,588 2,162,294 1,081,147 3,243,442 1,621,721 4,865,164 2,432,582 1,216,291 3,648,874 1,824,437 5,473,312 2,736,656 1,368,328 684,164 342,082 171,041 513,124 256,562 128,281 384,844 192,422 96,211 288,634 144,317 432,952 216,476 108,238 54,119 162,358 81,179 243,538 121,769 365,308 182,654 91,327 273,982 136,991 410,974 205,487 616,462 308,231 924,694 462,347 1,387,042 693,521 2,080,564 1,040,282 520,141 1,560,424 780,212 390,106 195,053 585,160 292,580 146,290

Other feeder batches with open delivery windows. Each feeder keeps its own target batch.