Properties of the Number 19917

Nineteen Thousand Nine Hundred Seventeen

Basics

Value: 19916 → 19917 → 19918

Parity: odd

Prime: No

Previous Prime: 19913

Next Prime: 19919

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2213

Divisors: 1, 3, 9, 2213, 6639, 19917

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100110111001101

Octal: 46715

Duodecimal: B639

Hexadecimal: 4dcd

Square: 396686889

Square Root: 141.12760183606892

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) is the limiting term of the n-th column of the triangle in A188919. A188920

Number T(n,k) of defective parking functions of length n and defect k; triangle T(n,k), n>=0, 0<=k<=max(0,n-1), read by rows. A264902

Numbers k with property that average digit of k² is s=7. A164773

Composition of function F = x/(1-x) from functions of the form [x + a(n)*xⁿ]: F = a(1)*x o x+a(2)*x² o x+a(3)*x³ o ... o x+a(n)*xⁿ o ... A119460

Expansion of ∏_k>=2 (1 + x^k)^k. A298598

Terms k of A228058 such that gcd(k - A048250(k), A162296(k) - k) = A162296(k) - k. A325376

Number of car parking assignments of n cars in n spaces, if one car does not park. A140647

Expansion of e.g.f. (1/x) * Series_Reversion( x·exp(-3·x/(1-x)) ). A390106

a(n) = a(n-1) + a(n-2) + 1, with a(0)=3, a(1)=9. A22408

L-th order palindromes with L > 2. A89381