3 × 7 × 19

Prime Factor Structure

Factorization String 3 × 7 × 19

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 8

Divisor Sum (σ) 640

Proper Divisor Sum 241

Digit Sum / Digital Root 21 (Root: 3)

Adjacent Primes #397 ← → #401

1 3 7 19 21 57 133 399

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

399 1,198 599 1,798 899 2,698 1,349 4,048 2,024 1,012 506 253 760 380 190 95 286 143 430 215 646 323 970 485 1,456 728 364 182 91 274 137 412 206 103 310 155 466 233 700 350 175 526 263 790 395 1,186 593 1,780 890 445 1,336 668 334 167 502 251 754 377 1,132 566

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