1,641,218

2 × 820609

Starting at 1,641,218, the Collatz iteration reaches 1 after 163 steps. The first transition is 820609; the starting value is even with 4 positive divisors.

Prime Factor Structure

Factorization String 2 × 820609

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 2,461,830

Proper Divisor Sum 820,612

Digit Sum / Digital Root 23 (Root: 5)

Adjacent Primes #1641217 ← → #1641229

Radix Representation

Decimal	1641218
Binary	110010000101100000010 (21 bits)
Octal	0o6205402
Hexadecimal	0x190B02

Divisor Catalog (4)

1 2 820,609 1,641,218

Collatz Trajectory (163 steps to reach 1)

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

1,641,218 820,609 2,461,828 1,230,914 615,457 1,846,372 923,186 461,593 1,384,780 692,390 346,195 1,038,586 519,293 1,557,880 778,940 389,470 194,735 584,206 292,103 876,310 438,155 1,314,466 657,233 1,971,700 985,850 492,925 1,478,776 739,388 369,694 184,847 554,542 277,271 831,814 415,907 1,247,722 623,861 1,871,584 935,792 467,896 233,948 116,974 58,487 175,462 87,731 263,194 131,597 394,792 197,396 98,698 49,349 148,048 74,024 37,012 18,506 9,253 27,760 13,880 6,940 3,470 1,735

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