3 × 7 × 43 × 709

Prime Factor Structure

Factorization String 3 × 7 × 43 × 709

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 999,680

Proper Divisor Sum 359,453

Digit Sum / Digital Root 21 (Root: 3)

Adjacent Primes #640223 ← → #640229

1 3 7 21 43 129 301 709 903 2,127 4,963 14,889 30,487 91,461 213,409 640,227

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

640,227 1,920,682 960,341 2,881,024 1,440,512 720,256 360,128 180,064 90,032 45,016 22,508 11,254 5,627 16,882 8,441 25,324 12,662 6,331 18,994 9,497 28,492 14,246 7,123 21,370 10,685 32,056 16,028 8,014 4,007 12,022 6,011 18,034 9,017 27,052 13,526 6,763 20,290 10,145 30,436 15,218 7,609 22,828 11,414 5,707 17,122 8,561 25,684 12,842 6,421 19,264 9,632 4,816 2,408 1,204 602 301 904 452 226 113

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