Properties of the Number 18676

Eighteen Thousand Six Hundred Seventy-Six

Basics

Value: 18675 → 18676 → 18677

Parity: even

Prime: No

Previous Prime: 18671

Next Prime: 18679

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 7 × 23 × 29

Divisors: 1, 2, 4, 7, 14, 23, 28, 29, 46, 58

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100011110100

Octal: 44364

Duodecimal: A984

Hexadecimal: 48f4

Square: 348792976

Square Root: 136.66016244685207

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

Heptagonal (or 7-gonal) pyramidal numbers: a(n) = n*(n+1)*(5·n-2)/6. A2413

a(n) = a(n-1) + a(n-2) + n + 2 with n>1, a(0)=1, a(1)=2. A210728

Least m>0 such that m⁴ >= n!. A214448

a(n) = (1/24)*(n+1)*(n+3)*(n²+22·n+88). A90950

Even heptagonal pyramidal numbers. A218325

Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k long ascents and long descents. A long ascent (descent) in a Dyck path is a maximal sequence of at least 2 consecutive up (down) steps. A127155

Divisors of 840. A18676

G.f. A(x) satisfies: the sum of the coefficients of x^k, k=0..n, in A(x)ⁿ equals ∑_k=0..n C(n,k)³ = A000172(n) (Franel numbers), for n>=0. A232687

a(n) = A006368(A006368(n)). A168221

Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of regions in the resulting planar graph. A367323