Properties of the Number 19666

Nineteen Thousand Six Hundred Sixty-Six

Basics

Value: 19665 → 19666 → 19667

Parity: even

Prime: No

Previous Prime: 19661

Next Prime: 19681

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 9833

Divisors: 1, 2, 9833, 19666

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110011010010

Octal: 46322

Duodecimal: B46A

Hexadecimal: 4cd2

Square: 386751556

Square Root: 140.2355161861645

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

Antidiagonal-sums of the array A377038(n,k) = n-th term of k-th differences of squarefree numbers (A005117). A377039

Numbers that are the sum of seven fourth powers in six or more ways. A345572

Numbers that are the sum of seven fourth powers in exactly six ways. A345828

a(n) = (27·n² + 9·n + 2)/2. A93485

Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n then a(n) is the trace of M(n)^-6. A114358

Numbers k such that A(k+1) = A(k) + 3, where A() = A005100() are the deficient numbers. A317046

Semiprime centered triangular numbers. A184481

Numbers k such that the continued fraction for sqrt(k) has period 57. A20396

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 573", based on the 5-celled von Neumann neighborhood. A272997

a(n) = ∑_{i=1..n, j=1..n, gcd(i,j)=1} i. A333297