Properties of the Number 19689

Nineteen Thousand Six Hundred Eighty-Nine

Basics

Value: 19688 → 19689 → 19690

Parity: odd

Prime: No

Previous Prime: 19687

Next Prime: 19697

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 6563

Divisors: 1, 3, 6563, 19689

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100110011101001

Octal: 46351

Duodecimal: B489

Hexadecimal: 4ce9

Square: 387656721

Square Root: 140.31749712705113

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

Numbers that are the sum of 7 positive 9th powers. A3396

Numbers that are the sum of 9 nonzero 8th powers. A3387

n satisfying σ(n+1) = σ(n-1). A55574

Numbers k such that φ(k) | sigma₈(k). A15766

Number of binary words of length n with autocorrelation function 2^n-1+1. A45691

Triangle read by rows in which row n lists n terms, starting with n⁴ + n - 1, such that the difference between successive terms is equal to n⁴ - 1 = A123865(n). A162624

Odd semiprimes p·q, such that Stern polynomial B(p·q,x) is a product of B(p,x) and B(q,x). A391256

Triangle read by rows in which row n lists n terms, starting with n, such that the difference between successive terms is equal to n⁴ - 1 = A123865(n). A162623

Smallest k > 6 such that sigma_n(k)/φ(k) is an integer. A78538

Numbers m such that m - 3 divides m^m + 3. A252041