1,649,780

2² × 5 × 11 × 7499

1,649,780 has digital root 8. The neighboring primes are 1649773 and 1649783; its proper-divisor sum differs from the starting integer by 480,440.

Prime Factor Structure

Factorization String 2^2 × 5 × 11 × 7499

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Total Divisors 24

Divisor Sum (σ) 3,780,000

Proper Divisor Sum 2,130,220

Digit Sum / Digital Root 35 (Root: 8)

Adjacent Primes #1649773 ← → #1649783

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

1,649,780 824,890 412,445 1,237,336 618,668 309,334 154,667 464,002 232,001 696,004 348,002 174,001 522,004 261,002 130,501 391,504 195,752 97,876 48,938 24,469 73,408 36,704 18,352 9,176 4,588 2,294 1,147 3,442 1,721 5,164 2,582 1,291 3,874 1,937 5,812 2,906 1,453 4,360 2,180 1,090 545 1,636 818 409 1,228 614 307 922 461 1,384 692 346 173 520 260 130 65 196 98 49