Properties of the Number -2128

One Hundred Twenty-Eight

Basics

Value: -2129 → -2128 → -2127

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ⁴ × 7 × 19

Divisors: 1, 2, 4, 7, 8, 14, 16, 19, 28, 38

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -100001010000

Octal: -4120

Duodecimal: -1294

Hexadecimal: -850

Square: 4528384

Square Root: 46.130250378683186

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

Expansion of ∏_k>=1 (1 - q^k)⁸/(1 - q^7·k) in powers of q. A282942

Determinants of 4 X 4 matrices of 16 consecutive primes. A118799

G.f. satisfies A(x) = 1 + x·A(x) / (1 + x·A(x)⁴). A364737

G.f. A(x) satisfies: 2ⁿ + 1 = ∑_k=0..n [x^k] A(x)ⁿ for n>=1. A100238

Row sums of number triangle A174014. A174016

Expansion of q * (f(-q, -q⁷) / f(-q³, -q⁵))² in powers of q where f(,) is Ramanujan's two-variable θ function. A230535

Triangular array from Steinbach matrices plus their squares as characteristic polynomials: M[i,j]=A[i,j]+A[i,j]²: A[i,j]²=Min[i,j]; CharacteristicPolynomial[M[i,j]];. A122073

Expansion of e.g.f. (1 + log(1-x))^x. A354083

Number of (w,x,y) such that w,x,y are all in {0,...,n} and |w-x| = |x-y|. A212959

a(n) = a(n-1) + a(n-2) + a(n-3) with a(0) = 1, a(1) = a(2) = 2. A214727