3,981,397

7² × 193 × 421

3,981,397 has digital root 4. The neighboring primes are 3981391 and 3981401; its proper-divisor sum differs from the starting integer by -3,296,318.

Prime Factor Structure

Factorization String 7^2 × 193 × 421

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Total Divisors 12

Divisor Sum (σ) 4,666,476

Proper Divisor Sum 685,079

Digit Sum / Digital Root 40 (Root: 4)

Adjacent Primes #3981391 ← → #3981401

1 7 49 193 421 1,351 2,947 9,457 20,629 81,253 568,771 3,981,397

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

3,981,397 11,944,192 5,972,096 2,986,048 1,493,024 746,512 373,256 186,628 93,314 46,657 139,972 69,986 34,993 104,980 52,490 26,245 78,736 39,368 19,684 9,842 4,921 14,764 7,382 3,691 11,074 5,537 16,612 8,306 4,153 12,460 6,230 3,115 9,346 4,673 14,020 7,010 3,505 10,516 5,258 2,629 7,888 3,944 1,972 986 493 1,480 740 370 185 556 278 139 418 209 628 314 157 472 236 118