Properties of the Number -215424

Two Hundred Fifteen Thousand Four Hundred Twenty-Four

Basics

Value: -215425 → -215424 → -215423

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ⁷ × 3 ² × 11 × 17

Divisors: 1, 2, 3, 4, 6, 8, 9, 11, 12, 16

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

7925 Try Today's Challenge

Representations

Binary: -110100100110000000

Octal: -644600

Duodecimal: -A4800

Hexadecimal: -34980

Square: 46407499776

Square Root: 464.1379105395292

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

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7. A252243

Expansion of g.f. A(x) satisfying A(x) = A( x²*(1+x)³ ) / (x*(1+x)²). A369546

First elements of maximal isospectral chains of length 3. A335082

Triangle read by rows: k-th "a-number" of star graph K_1,n-1. A220901

a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers), t = (primes). A24478

a(n) = n! - ((n-1)!!)². A88979

Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7. A252237

Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7. A252240

Obverse convolution (n²)**(2ⁿ); see Comments. A374887

Duplicate of A024478. A25090