Properties of the Number -1869

Eight Hundred Sixty-Nine

Basics

Value: -1870 → -1869 → -1868

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 89

Divisors: 1, 3, 7, 21, 89, 267, 623, 1869

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11101001101

Octal: -3515

Duodecimal: -10B9

Hexadecimal: -74d

Square: 3493161

Square Root: 43.23193264243457

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) = Fibonacci(n-1)² - Fibonacci(n)². A121646

a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4, with initial terms 1,1,-2,-1. A111571

Determinant of the n X n matrix with (i,j)-entry equal to A008683(i+j-1) for all i,j = 1..n. A228548

Expansion of (1-4x)/(1-x²+x³). A117379

Row sums of triangle A161363. A161375

tanh(sec(x)*arctanh(x))=x+3/3!*x³-15/5!*x⁵-1869/7!*x⁷-88959/9!*x⁹... A12848

A triangle sequence from coefficients of an infinite sum polynomial: p(x,n)=Sum[(n - k - 1)ⁿ*Binomial[x, k], {k, 0, Infinity}]/2^{x - n}. A176863

Partial sums of A299254. A299260

Partial sums of A299289. A299290

a(n) = a(n-1) + a(n-6), with a(i) = 1 for i = 0..5. A5708