Properties of the Number 18424

Eighteen Thousand Four Hundred Twenty-Four

Basics

Value: 18423 → 18424 → 18425

Parity: even

Prime: No

Previous Prime: 18413

Next Prime: 18427

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 7 ² × 47

Divisors: 1, 2, 4, 7, 8, 14, 28, 47, 49, 56

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011111111000

Octal: 43770

Duodecimal: A7B4

Hexadecimal: 47f8

Square: 339443776

Square Root: 135.73503600765721

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) = 1² + 3² + 5² + 7² + ... + (2·n-1)² = n*(4·n² - 1)/3. A447

Binomial coefficients C(49,n). A17765

Generalized Stirling number triangle of first kind read by rows: T(n, k) = [x^k] ∏_m=1..n (x - m - r), with r = 1. A49444

(Prime(n)# - 4)/2 is prime, where x# is the primorial A034386(x). A67026

Consider the base-3 Kaprekar map n->K(n) defined in A164993. Sequence gives numbers belonging to cycles, including fixed points. A164998

Array read by antidiagonals: T(n,k) = number of barred preferential arrangements of k things with n bars (k >=0, n >= 0). A226513

Unsigned 2-Stirling numbers of the first kind. A143491

Consider the base-3 Kaprekar map n->K(n) defined in A164993. Sequence gives numbers belonging to cycles of length greater than 1. A165000

Triangle read by rows: T(n,k) = binomial(n², k), 0 <= k <= n. A90642

Triangle read by rows: coefficients of 1; 1(X+2); 1(X+2)(X+3); 1(X+2)(X+3)(X+4); .... A145324