Properties of the Number 19228

Nineteen Thousand Two Hundred Twenty-Eight

Basics

Value: 19227 → 19228 → 19229

Parity: even

Prime: No

Previous Prime: 19219

Next Prime: 19231

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 11 × 19 × 23

Divisors: 1, 2, 4, 11, 19, 22, 23, 38, 44, 46

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100101100011100

Octal: 45434

Duodecimal: B164

Hexadecimal: 4b1c

Square: 369715984

Square Root: 138.6650640933036

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

Starting from generation 8 add previous and next term yielding generation 9. A48455

Number of necklaces with 7 black beads and n-7 white beads. A32192

Numbers m such that 2*φ(m) = φ(m+1). A50472

Array read by antidiagonals: T(n,k) is the number of nonequivalent dissections of a polygon into n k-gons by nonintersecting diagonals rooted at a cell up to rotation (k >= 3). A295222

a(n) = ∑_k=0..n binomial(4·n-2·k,n-k). A390407

a(n) = floor(C(n,6)/7). A11797

Number of independent components for a Weyl tensor in n dimensions. A52472

T(n,k)=Number of nXk arrays with each row a permutation of 1..k having at least as many downsteps as the preceding row, with rows in lexicographically nonincreasing order. A222005

Coefficients of power series for (1 - (1-8·x)^1/4)/2. A48779

a(n) = T(2·n+1, n), array T as in A054106. A54109