1,917,821

17 × 37 × 3049

Starting at 1,917,821, the Collatz iteration reaches 1 after 215 steps. The first transition is 5753464; the starting value is odd with 8 positive divisors.

Prime Factor Structure

Factorization String 17 × 37 × 3049

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 8

Divisor Sum (σ) 2,086,200

Proper Divisor Sum 168,379

Digit Sum / Digital Root 29 (Root: 2)

Adjacent Primes #1917793 ← → #1917847

Radix Representation

Decimal	1917821
Binary	111010100001101111101 (21 bits)
Octal	0o7241575
Hexadecimal	0x1D437D

Divisor Catalog (8)

1 17 37 629 3,049 51,833 112,813 1,917,821

Collatz Trajectory (215 steps to reach 1)

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

1,917,821 5,753,464 2,876,732 1,438,366 719,183 2,157,550 1,078,775 3,236,326 1,618,163 4,854,490 2,427,245 7,281,736 3,640,868 1,820,434 910,217 2,730,652 1,365,326 682,663 2,047,990 1,023,995 3,071,986 1,535,993 4,607,980 2,303,990 1,151,995 3,455,986 1,727,993 5,183,980 2,591,990 1,295,995 3,887,986 1,943,993 5,831,980 2,915,990 1,457,995 4,373,986 2,186,993 6,560,980 3,280,490 1,640,245 4,920,736 2,460,368 1,230,184 615,092 307,546 153,773 461,320 230,660 115,330 57,665 172,996 86,498 43,249 129,748 64,874 32,437 97,312 48,656 24,328 12,164

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