Properties of the Number -1720

Seven Hundred Twenty

Basics

Value: -1721 → -1720 → -1719

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 5 × 43

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 43, 86

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11010111000

Octal: -3270

Duodecimal: -BB4

Hexadecimal: -6b8

Square: 2958400

Square Root: 41.47288270665544

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 e.g.f.: log(1+sin(x))/exp(x). A9337

Triangle of coefficients of Gaussian polynomials [2n+5,4]_q represented as finite sum of terms (1+q²)^k*q^g-k, where k = 0,1,...,g with g=4n+2. A267484

Expansion of q^-1/2 * k(q) * (1 - k(q)⁴) * (K(q) / (π/2))⁶ / 4 in powers of q where k(), k'(), K() are Jacobi elliptic functions. A225923

Expansion of q^-1/4 * η(q)⁸ * η(q⁴)² / η(q²)⁵ in powers of q. A244276

Expansion of q * (φ(-q²) * ψ(-q)²)⁴ in powers of q where φ(), ψ() are Ramanujan θ functions. A225912

Expansion of 1 - x/(1 - x³/(1 - x⁵/(1 - x⁷/(1 - x⁹/(1 - ... - x^2·k-1/(1 - ...)))))), a continued fraction. A291874

First differences of A160239. A245543

McKay-Thompson series of class 44a for Monster. A58680

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

Sum of the first n primes. A7504