2,645,978

2 × 19 × 179 × 389

Starting at 2,645,978, the Collatz iteration reaches 1 after 125 steps. The first transition is 1322989; the starting value is even with 16 positive divisors.

Prime Factor Structure

Factorization String 2 × 19 × 179 × 389

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 4,212,000

Proper Divisor Sum 1,566,022

Digit Sum / Digital Root 41 (Root: 5)

Adjacent Primes #2645977 ← → #2645987

Radix Representation

Decimal	2645978
Binary	1010000101111111011010 (22 bits)
Octal	0o12057732
Hexadecimal	0x285FDA

Divisor Catalog (16)

1 2 19 38 179 358 389 778 3,401 6,802 7,391 14,782 69,631 139,262 1,322,989 2,645,978

Collatz Trajectory (125 steps to reach 1)

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

2,645,978 1,322,989 3,968,968 1,984,484 992,242 496,121 1,488,364 744,182 372,091 1,116,274 558,137 1,674,412 837,206 418,603 1,255,810 627,905 1,883,716 941,858 470,929 1,412,788 706,394 353,197 1,059,592 529,796 264,898 132,449 397,348 198,674 99,337 298,012 149,006 74,503 223,510 111,755 335,266 167,633 502,900 251,450 125,725 377,176 188,588 94,294 47,147 141,442 70,721 212,164 106,082 53,041 159,124 79,562 39,781 119,344 59,672 29,836 14,918 7,459 22,378 11,189 33,568 16,784

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