721,395

3² × 5 × 17 × 23 × 41

721,395 is odd and not a perfect square. Its factorization is 3^2 × 5 × 17 × 23 × 41 and its 48 divisors sum to 1,415,232.

Prime Factor Structure

Factorization String 3^2 × 5 × 17 × 23 × 41

Distinct Prime Factors 5

Square Status No

Abundance Measure Deficient

Total Divisors 48

Divisor Sum (σ) 1,415,232

Proper Divisor Sum 693,837

Digit Sum / Digital Root 27 (Root: 9)

Adjacent Primes #721387 ← → #721397

1 3 5 9 15 17 23 41 45 51 69 85 115 123 153 205 207 255 345 369 391 615 697 765 943 1,035 1,173 1,845 1,955 2,091 2,829 3,485 3,519 4,715 5,865 6,273 8,487 10,455 14,145 16,031 17,595 31,365 42,435 48,093 80,155 144,279 240,465 721,395

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

721,395 2,164,186 1,082,093 3,246,280 1,623,140 811,570 405,785 1,217,356 608,678 304,339 913,018 456,509 1,369,528 684,764 342,382 171,191 513,574 256,787 770,362 385,181 1,155,544 577,772 288,886 144,443 433,330 216,665 649,996 324,998 162,499 487,498 243,749 731,248 365,624 182,812 91,406 45,703 137,110 68,555 205,666 102,833 308,500 154,250 77,125 231,376 115,688 57,844 28,922 14,461 43,384 21,692 10,846 5,423 16,270 8,135 24,406 12,203 36,610 18,305 54,916 27,458