1,918,173

3 × 639391

Starting at 1,918,173, the Collatz iteration reaches 1 after 171 steps. The first transition is 5754520; the starting value is odd with 4 positive divisors.

Prime Factor Structure

Factorization String 3 × 639391

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 2,557,568

Proper Divisor Sum 639,395

Digit Sum / Digital Root 30 (Root: 3)

Adjacent Primes #1918157 ← → #1918181

Radix Representation

Decimal	1918173
Binary	111010100010011011101 (21 bits)
Octal	0o7242335
Hexadecimal	0x1D44DD

Divisor Catalog (4)

1 3 639,391 1,918,173

Collatz Trajectory (171 steps to reach 1)

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

1,918,173 5,754,520 2,877,260 1,438,630 719,315 2,157,946 1,078,973 3,236,920 1,618,460 809,230 404,615 1,213,846 606,923 1,820,770 910,385 2,731,156 1,365,578 682,789 2,048,368 1,024,184 512,092 256,046 128,023 384,070 192,035 576,106 288,053 864,160 432,080 216,040 108,020 54,010 27,005 81,016 40,508 20,254 10,127 30,382 15,191 45,574 22,787 68,362 34,181 102,544 51,272 25,636 12,818 6,409 19,228 9,614 4,807 14,422 7,211 21,634 10,817 32,452 16,226 8,113 24,340 12,170

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