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Properties of the Number 19729

Nineteen Thousand Seven Hundred Twenty-Nine

Basics

Value: 19728 → 19729 → 19730

Parity: odd

Prime: No

Previous Prime: 19727

Next Prime: 19739

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 109 × 181

Divisors: 1, 109, 181, 19729

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110100010001

Octal: 46421

Duodecimal: B501

Hexadecimal: 4d11

Square: 389233441

Square Root: 140.45995870709916

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

Zsigmondy numbers for a = 5, b = 3: Zs(n, 5, 3) is the greatest divisor of 5n - 3n (A005058) that is relatively prime to 5m - 3m for all positive integers m < n. A109347
Pseudoprimes to base 17. A20145
Number of digits in n-th Fermat number (A000215). A57755
Semiprimes which are the sum of three distinct positive cubes in two or more distinct ways. A180089
Strong pseudoprimes to base 17. A20243
Strong pseudoprimes to base 19. A20245
Strong pseudoprimes to base 32. A20258
Strong pseudoprimes to base 92. A20318
Numbers k such that the continued fraction for sqrt(k) has period 89. A20428
Indices of primes in the sequence defined by A(0) = 29, A(n) = 10·A(n-1) - 21 for n > 0. A101965