3² × 13² × 421

Prime Factor Structure

Factorization String 3^2 × 13^2 × 421

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 18

Divisor Sum (σ) 1,003,938

Proper Divisor Sum 363,597

Digit Sum / Digital Root 18 (Root: 9)

Adjacent Primes #640333 ← → #640363

1 3 9 13 39 117 169 421 507 1,263 1,521 3,789 5,473 16,419 49,257 71,149 213,447 640,341

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

640,341 1,921,024 960,512 480,256 240,128 120,064 60,032 30,016 15,008 7,504 3,752 1,876 938 469 1,408 704 352 176 88 44 22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 1

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