Properties of the Number -989

Nine Hundred Eighty-Nine

Basics

Value: -990 → -989 → -988

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 26

Digital Root: 8

Palindrome: Yes

Factorization: 23 × 43

Divisors: 1, 23, 43, 989

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111011101

Octal: -1735

Duodecimal: -6A5

Hexadecimal: -3dd

Square: 978121

Square Root: 31.448370387032774

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

G.f. satisfies: A(x) = 1/(1 + x·A(x²)) and also the continued fraction: 1 + x·A(x³) = [1; 1/x, 1/x², 1/x⁴, 1/x⁸, ..., 1/x^{2^(n-1}), ...]. A101912

Expansion of g.f. 1+x+(1+3·x+x²)/(1+x)³. A201163

Array T(r,c) read by antidiagonals: values of triangle A098493 interpreted as polynomials, r >= 0. A98495

Expansion of ∏_k>=0 (1-x^4·k+3)^4·k+3. A285213

G.f. A(x) satisfies A(x) = 1 + x / A(x²). A218031

A sixth-order linear divisibility sequence: a(n+6) = -3·a(n+5) - 5·a(n+4) - 5·a(n+3) - 5·a(n+2) - 3·a(n+1) - a(n). A5120

Expansion of (1+x+5x²+2x³) / (1-4x²+x⁴). A108413

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 379", based on the 5-celled von Neumann neighborhood. A271538

Main diagonal of triangle A098495. A98497