Properties of the Number 19387

Nineteen Thousand Three Hundred Eighty-Seven

Basics

Value: 19386 → 19387 → 19388

Parity: odd

Prime: Yes

Previous Prime: 19381

Next Prime: 19391

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 19387

Divisors: 1, 19387

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101110111011

Octal: 45673

Duodecimal: B277

Hexadecimal: 4bbb

Square: 375855769

Square Root: 139.2372076709383

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

Number of "rooted index-functional forests" (Riffs) on n nodes. Number of "rooted odd trees with only exponent symmetries" (Rotes) on 2n+1 nodes. A61396

T(n,k)=Number of nXk 0..4 arrays with each element·equal to the number of its horizontal and vertical neighbors equal to 2,4,1,0,1 for x=0,1,2,3,4. A197373

First primes of arithmetic progressions of 5 primes each with the common difference 30. A227281

Primes p of Erdos-Selfridge class 4+ with largest prime factor of p+1 not of class 3+. A129472

G.f. satisfies: A(x) = x/(1 - A(A(A(x)))). A140094

Row sums in triangle A081994. A81997

Triangle of coefficients of polynomials v(n,x) jointly generated with A210741; see the Formula section. A210742

Primes p such that p + 2², p + 4² and p + 6² are also primes. A92475

a(n) = n³ - (3*(n+3))². A153259

Primes of the form 7·x² - 5·y², where·and y are successive natural numbers. A176557