Properties of the Number -189

One Hundred Eighty-Nine

Basics

Value: -190 → -189 → -188

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 7

Divisors: 1, 3, 7, 9, 21, 27, 63, 189

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: -10111101

Octal: -275

Duodecimal: -139

Hexadecimal: -bd

Square: 35721

Square Root: 13.74772708486752

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+1)*(2-n)/2. A80956

Expansion of (1 - x)/(1 + x - 2·x² + x³). A78039

Irregular triangle read by rows: mean version of Girard-Waring formula A210258, for m = 3 data values. A287768

a(n) = (3ⁿ/n!) * ∏_k=0..n-1 (3·k - 2). A4989

a(n) = 3·a(n-2) - a(n-3), with a(0)=0, a(1)=a(2)=-3. A215665

a(n) = 1·2 - 3·4 + 5·6 - 7·8 + 9·10 - 11·12 + 13·14 - ... + (up to n). A319373

Triangle read by rows: row 1 is [1]; for n >= 1, row n gives coefficients of expansion of (-1/x + x)*(1/x + 1 + x)^n-1 in order of increasing powers of x. A349812

Triangle read by rows: T(n, m) = S1(n, m)*9^n-m, where S1 are the signed Stirling numbers of first kind A008275 (n >= 1, 1 <= m <= n). A51231

Triangle read by rows, e.g.f. exp(x·z)*((exp(x/2)+exp(x·3/2))/((exp(3·x/2)+ 2·cos(sqrt(3)*x/2))/3)-1). A215064

Sequence is {a(3,n)}, where a(m,n) is defined at sequence A110665. A110668