399,020

2² × 5 × 71 × 281

Prime Factor Structure

Factorization String 2^2 × 5 × 71 × 281

Distinct Prime Factors 4

Square Status No

Abundance Measure Abundant

Total Divisors 24

Divisor Sum (σ) 852,768

Proper Divisor Sum 453,748

Digit Sum / Digital Root 23 (Root: 5)

Adjacent Primes #398989 ← → #399023

1 2 4 5 10 20 71 142 281 284 355 562 710 1,124 1,405 1,420 2,810 5,620 19,951 39,902 79,804 99,755 199,510 399,020

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

399,020 199,510 99,755 299,266 149,633 448,900 224,450 112,225 336,676 168,338 84,169 252,508 126,254 63,127 189,382 94,691 284,074 142,037 426,112 213,056 106,528 53,264 26,632 13,316 6,658 3,329 9,988 4,994 2,497 7,492 3,746 1,873 5,620 2,810 1,405 4,216 2,108 1,054 527 1,582 791 2,374 1,187 3,562 1,781 5,344 2,672 1,336 668 334 167 502 251 754 377 1,132 566 283 850 425

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