Properties of the Number 39689

Thirty-Nine Thousand Six Hundred Eighty-Nine

Basics

Value: 39688 → 39689 → 39690

Parity: odd

Prime: No

Previous Prime: 39679

Next Prime: 39703

Digit Sum: 35

Digital Root: 8

Palindrome: No

Factorization: 13 × 43 × 71

Divisors: 1, 13, 43, 71, 559, 923, 3053, 39689

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001101100001001

Octal: 115411

Duodecimal: 1AB75

Hexadecimal: 9b09

Square: 1575216721

Square Root: 199.22098283062454

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = 4·n³ - 6·n² + 1. A141530

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7. A252523

Lucas pseudoprimes. A217120

a(n) = (n+3)²*n/2 + 1. A154560

Numerators of continued fraction convergents to sqrt(205). A41380

Numerators of continued fraction convergents to sqrt(820). A42582

Nonprime numbers n such that φ(n) divides n² - 1, where φ(n) (A000010) is Euler's totient function. A98271

Composite squarefree numbers k such that k²-1 is divisible by p-1 and p+1, where p are all the prime factors of k. A306685

Numbers k such that k divides A306069(k). A344731

Numbers k such that φ(k) + φ(k+1) = σ(k). A67799