Properties of the Number 4218

Four Thousand Two Hundred Eighteen

Basics

Value: 4217 → 4218 → 4219

Parity: even

Prime: No

Previous Prime: 4217

Next Prime: 4219

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 19 × 37

Divisors: 1, 2, 3, 6, 19, 37, 38, 57, 74, 111

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1000001111010

Octal: 10172

Duodecimal: 2536

Hexadecimal: 107a

Square: 17791524

Square Root: 64.94613152451807

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) = n*(n+1)*(2·n+1)/3. A6331

6 times triangular numbers: a(n) = 3·n*(n+1). A28896

Expansion of (1+x²)/((1-x)²*(1-x²)²). A5993

Numbers k such that k² divides 11^k - 1. A127092

Numbers k such that φ(k) is a perfect biquadrate. A78164

a(n) = 1*(n) + 2*(n-1) + 3*(n-2) + ... + (n+1-k)*k, where k = floor((n+1)/2). A23855

Six times hexagonal numbers: 6·n*(2·n-1). A152746

Numbers k such that k³ divides 5^k² - 1. A177905

Numbers k such that for any positive integers (a, b), if a·b = k then a + b is prime. A80715

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw. A253326