λ
Sequence Observatory

1,239,217

7 × 23 × 43 × 179
Deficient Odd Composite

Starting at 1,239,217, the Collatz iteration reaches 1 after 80 steps. The first transition is 3717652; the starting value is odd with 16 positive divisors.

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Prime Factor Structure

Factorization String 7 × 23 × 43 × 179
Distinct Prime Factors 4
Square Status No
Abundance Measure Deficient

Analytical Properties

Total Divisors 16
Divisor Sum (σ) 1,520,640
Proper Divisor Sum 281,423
Digit Sum / Digital Root 25 (Root: 7)
Adjacent Primes #1239197 ← → #1239223

Radix Representation

Decimal 1239217
Binary 100101110100010110001 (21 bits)
Octal 0o4564261
Hexadecimal 0x12E8B1

Divisor Catalog (5 of 16)

1 7 23 43 161

Collatz Trajectory (80 steps to reach 1)

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

Showing the first 5 trajectory entries; the stopping-time total above is unchanged.

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