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Properties of the Number 19287

Nineteen Thousand Two Hundred Eighty-Seven

Basics

Value: 19286 → 19287 → 19288

Parity: odd

Prime: No

Previous Prime: 19273

Next Prime: 19289

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 2 × 2143

Divisors: 1, 3, 9, 2143, 6429, 19287

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100101101010111

Octal: 45527

Duodecimal: B1B3

Hexadecimal: 4b57

Square: 371988369

Square Root: 138.87764398923247

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) = a(n-1) + a(n-2) + n, a(0) = a(1) = 1. A30119
Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths starting at each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 5, n >= 2. A214023
a(n) = prime(n)2 - n. A182174
Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths starting at each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 8, n >= 2. A214038
Number of pairs (p,q) of partitions of n such that the set of parts in q is a proper subset of the set of parts in p. A369910
Fibonacci sequence beginning 1, 31. A22401
Number of n-node unlabeled rooted trees with thinning limbs and root outdegree (branching factor) 6. A244707
p-INVERT of (1,0,1,0,0,0,0,...), where p(S) = (1 - S)(1 - 2 S). A291734
Number of partitions of n into parts not of the form 21k, 21k+10 or 21k-10. Also number of partitions with at most 9 parts of size 1 and differences between parts at distance 9 are greater than 1. A35988
Consider the spiral of Theodorus (A072895). This sequence is closely related to A224269 and gives the number of k successive revolutions such that the triangles are closer to 360 degrees than any previous triangles. A227626