1,380,380

2² × 5 × 69019

Starting at 1,380,380, the Collatz iteration reaches 1 after 155 steps. The first transition is 690190; the starting value is even with 12 positive divisors.

Prime Factor Structure

Factorization String 2^2 × 5 × 69019

Distinct Prime Factors 3

Square Status No

Abundance Measure Abundant

Analytical Properties

Total Divisors 12

Divisor Sum (σ) 2,898,840

Proper Divisor Sum 1,518,460

Digit Sum / Digital Root 23 (Root: 5)

Adjacent Primes #1380377 ← → #1380389

Radix Representation

Decimal	1380380
Binary	101010001000000011100 (21 bits)
Octal	0o5210034
Hexadecimal	0x15101C

Divisor Catalog (12)

1 2 4 5 10 20 69,019 138,038 276,076 345,095 690,190 1,380,380

Collatz Trajectory (155 steps to reach 1)

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

1,380,380 690,190 345,095 1,035,286 517,643 1,552,930 776,465 2,329,396 1,164,698 582,349 1,747,048 873,524 436,762 218,381 655,144 327,572 163,786 81,893 245,680 122,840 61,420 30,710 15,355 46,066 23,033 69,100 34,550 17,275 51,826 25,913 77,740 38,870 19,435 58,306 29,153 87,460 43,730 21,865 65,596 32,798 16,399 49,198 24,599 73,798 36,899 110,698 55,349 166,048 83,024 41,512 20,756 10,378 5,189 15,568 7,784 3,892 1,946 973 2,920 1,460

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