2,781,025

5² × 13 × 43 × 199

2,781,025 has digital root 7. The neighboring primes are 2781019 and 2781029; its proper-divisor sum differs from the starting integer by -1,742,850.

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Factorization String 5^2 × 13 × 43 × 199

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Total Divisors 24

Divisor Sum (σ) 3,819,200

Proper Divisor Sum 1,038,175

Digit Sum / Digital Root 25 (Root: 7)

Adjacent Primes #2781019 ← → #2781029

1 5 13 25 43

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

Showing the first 5 trajectory entries; the stopping-time total above is unchanged.

2,781,025 8,343,076 4,171,538 2,085,769 6,257,308

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