Properties of the Number 19897

Nineteen Thousand Eight Hundred Ninety-Seven

Basics

Value: 19896 → 19897 → 19898

Parity: odd

Prime: No

Previous Prime: 19891

Next Prime: 19913

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 101 × 197

Divisors: 1, 101, 197, 19897

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100110110111001

Octal: 46671

Duodecimal: B621

Hexadecimal: 4db9

Square: 395890609

Square Root: 141.05672617780408

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

Smallest number that requires n iterations of the unitary totient function (A047994) to reach 1. A3271

Number of integer partitions of n containing all divisors of all parts. A371178

Number of fat trees on n labeled vertices. A55779

Number of unrooted triangulations with reflection symmetry of a pentagon with n internal nodes. A5506

Numerator of the expected fraction of guests without a napkin in Conway's napkin problem with n guests. A341232

Fibonacci sequence beginning 1, 32. A22402

(n - φ(n)) | σ(n) for composite n not congruent to 2 (mod 4). A55164

Numbers k such that 3·2^k - 7 is prime. A59747

Number of length n+4 0..6 arrays with every five consecutive terms having four times some element equal to the sum of the remaining four. A249654

a(n) = (-1) * round(j((1 + sqrt(-n))/2)), where j is j-invariant. A302142