Properties of the Number -1870

Eight Hundred Seventy

Basics

Value: -1871 → -1870 → -1869

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 11 × 17

Divisors: 1, 2, 5, 10, 11, 17, 22, 34, 55, 85

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11101001110

Octal: -3516

Duodecimal: -10BA

Hexadecimal: -74e

Square: 3496900

Square Root: 43.243496620879306

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

Signed Fibonomial triangle. A55870

a(n) = ∑_k=0..n binomial(n, floor(k/2))*(-2)^n-k. A127361

Riordan array (1/(1+x), x(1-x)/(1+x)²). A110511

Matrix logarithm of triangle A113287. A113290

A coefficients of characteristic polynomials of A_n Cartan matrices times their transposes: t(n,m,d)=If[ n == m, 2, If[n == m - 1 || n == m + 1, -1, 0]]. M(d)=t(n,m,d)*Transpose[t(n,m,d)]. A158199

Triangle read by rows: T(n,k) appears in the transformation ∑_k=0..n (k+1)*x^k = ∑_k=0..n T(n,k)*(x+3k)^k. A253384

Irregular triangular array: row n is the linear recurrence signature of F(i)ⁿ - F(i-1)ⁿ, where F = A000045 (Fibonacci numbers). A379048

The Golden Triangle: T(n,k) = A001654(k) for n>=0 and 0<=k<=n. A180662

10-gonal (or decagonal) numbers: a(n) = n*(4·n-3). A1107

Golden rectangle numbers: F(n) * F(n+1), where F(n) = A000045(n) (Fibonacci numbers). A1654