3 × 7² × 4357

Prime Factor Structure

Factorization String 3 × 7^2 × 4357

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 12

Divisor Sum (σ) 993,624

Proper Divisor Sum 353,145

Digit Sum / Digital Root 30 (Root: 3)

Adjacent Primes #640477 ← → #640483

1 3 7 21 49 147 4,357 13,071 30,499 91,497 213,493 640,479

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

640,479 1,921,438 960,719 2,882,158 1,441,079 4,323,238 2,161,619 6,484,858 3,242,429 9,727,288 4,863,644 2,431,822 1,215,911 3,647,734 1,823,867 5,471,602 2,735,801 8,207,404 4,103,702 2,051,851 6,155,554 3,077,777 9,233,332 4,616,666 2,308,333 6,925,000 3,462,500 1,731,250 865,625 2,596,876 1,298,438 649,219 1,947,658 973,829 2,921,488 1,460,744 730,372 365,186 182,593 547,780 273,890 136,945 410,836 205,418 102,709 308,128 154,064 77,032 38,516 19,258 9,629 28,888 14,444 7,222 3,611 10,834 5,417 16,252 8,126 4,063

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