1,998,005

5 × 399601

Starting at 1,998,005, the Collatz iteration reaches 1 after 153 steps. The first transition is 5994016; the starting value is odd with 4 positive divisors.

Prime Factor Structure

Factorization String 5 × 399601

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 2,397,612

Proper Divisor Sum 399,607

Digit Sum / Digital Root 32 (Root: 5)

Adjacent Primes #1997999 ← → #1998019

Radix Representation

Decimal	1998005
Binary	111100111110010110101 (21 bits)
Octal	0o7476265
Hexadecimal	0x1E7CB5

Divisor Catalog (4)

1 5 399,601 1,998,005

Collatz Trajectory (153 steps to reach 1)

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

1,998,005 5,994,016 2,997,008 1,498,504 749,252 374,626 187,313 561,940 280,970 140,485 421,456 210,728 105,364 52,682 26,341 79,024 39,512 19,756 9,878 4,939 14,818 7,409 22,228 11,114 5,557 16,672 8,336 4,168 2,084 1,042 521 1,564 782 391 1,174 587 1,762 881 2,644 1,322 661 1,984 992 496 248 124 62 31 94 47 142 71 214 107 322 161 484 242 121 364

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