1,286,445

3 × 5 × 139 × 617

Starting at 1,286,445, the Collatz iteration reaches 1 after 142 steps. The first transition is 3859336; the starting value is odd with 16 positive divisors.

Prime Factor Structure

Factorization String 3 × 5 × 139 × 617

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 2,076,480

Proper Divisor Sum 790,035

Digit Sum / Digital Root 30 (Root: 3)

Adjacent Primes #1286419 ← → #1286447

Radix Representation

Decimal	1286445
Binary	100111010000100101101 (21 bits)
Octal	0o4720455
Hexadecimal	0x13A12D

Divisor Catalog (16)

1 3 5 15 139 417 617 695 1,851 2,085 3,085 9,255 85,763 257,289 428,815 1,286,445

Collatz Trajectory (142 steps to reach 1)

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

1,286,445 3,859,336 1,929,668 964,834 482,417 1,447,252 723,626 361,813 1,085,440 542,720 271,360 135,680 67,840 33,920 16,960 8,480 4,240 2,120 1,060 530 265 796 398 199 598 299 898 449 1,348 674 337 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

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