1,646,890

2 × 5 × 7² × 3361

1,646,890 has digital root 7. The neighboring primes are 1646861 and 1646893; its proper-divisor sum differs from the starting integer by 155,632.

Prime Factor Structure

Factorization String 2 × 5 × 7^2 × 3361

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Total Divisors 24

Divisor Sum (σ) 3,449,412

Proper Divisor Sum 1,802,522

Digit Sum / Digital Root 34 (Root: 7)

Adjacent Primes #1646861 ← → #1646893

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

1,646,890 823,445 2,470,336 1,235,168 617,584 308,792 154,396 77,198 38,599 115,798 57,899 173,698 86,849 260,548 130,274 65,137 195,412 97,706 48,853 146,560 73,280 36,640 18,320 9,160 4,580 2,290 1,145 3,436 1,718 859 2,578 1,289 3,868 1,934 967 2,902 1,451 4,354 2,177 6,532 3,266 1,633 4,900 2,450 1,225 3,676 1,838 919 2,758 1,379 4,138 2,069 6,208 3,104 1,552 776 388 194 97 292

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