Properties of the Number -126890

One Hundred Twenty-Six Thousand Eight Hundred Ninety

Basics

Value: -126891 → -126890 → -126889

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 5 × 12689

Divisors: 1, 2, 5, 10, 12689, 25378, 63445, 126890

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11110111110101010

Octal: -367652

Duodecimal: -61522

Hexadecimal: -1efaa

Square: 16101072100

Square Root: 356.21622646926124

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

Minimal positive solution·of Pell equation y² - A077426(n)*x² = -4. A78357

Minimal positive solution a(n) of Diophantine equation b(n)² - b(n)*a(n) - G(n)*a(n)² = +1 or -1 with G(n) := A078358(n). The companion sequence is b(n)=A077057(n). A77058

Write fundamental unit for real quadratic field of discriminant n as x + y*ω; sequence gives values of y for n == 1 (mod 4). A53373

Twice the coefficient of sqrt(q) in e^h, where e is the fundamental unit and h is the class number of Q(sqrt(q)), q prime and congruent to 1 mod 4. (The coefficient lies in (1/2)Z, so twice it is an integer.) A225432

Expansion of e.g.f. sin(arctan(x) + log(x+1)). A12961