1,218,215

5 × 243643

1,218,215 factors as 5 × 243643. Its 4 positive divisors give a proper-divisor sum of 243,649, so this integer is deficient. The Collatz stopping time is 116 steps.

Prime Factor Structure

Factorization String 5 × 243643

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 1,461,864

Proper Divisor Sum 243,649

Digit Sum / Digital Root 20 (Root: 2)

Adjacent Primes #1218211 ← → #1218221

Radix Representation

Decimal	1218215
Binary	100101001011010100111 (21 bits)
Octal	0o4513247
Hexadecimal	0x1296A7

Divisor Catalog (4)

1 5 243,643 1,218,215

Collatz Trajectory (116 steps to reach 1)

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

1,218,215 3,654,646 1,827,323 5,481,970 2,740,985 8,222,956 4,111,478 2,055,739 6,167,218 3,083,609 9,250,828 4,625,414 2,312,707 6,938,122 3,469,061 10,407,184 5,203,592 2,601,796 1,300,898 650,449 1,951,348 975,674 487,837 1,463,512 731,756 365,878 182,939 548,818 274,409 823,228 411,614 205,807 617,422 308,711 926,134 463,067 1,389,202 694,601 2,083,804 1,041,902 520,951 1,562,854 781,427 2,344,282 1,172,141 3,516,424 1,758,212 879,106 439,553 1,318,660 659,330 329,665 988,996 494,498 247,249 741,748 370,874 185,437 556,312 278,156

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