Properties of the Number -1840

Eight Hundred Forty

Basics

Value: -1841 → -1840 → -1839

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ⁴ × 5 × 23

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 23, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -11100110000

Octal: -3460

Duodecimal: -1094

Hexadecimal: -730

Square: 3385600

Square Root: 42.89522117905443

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

Irregular triangle read by rows T(n,m), coefficients in power/Fourier series expansion of an arbitrary anharmonic oscillator's exact phase space angular velocity. A276814

Expansion of e.g.f. 1 / ∑_{n >= 0} (n+1)³*xⁿ/n!. A302870

Numerator of Hermite(n, 4/7). A158991

Triangle read by rows: expansion of Q(y, n), where Q(y,0)=1; Q(y,1)=y; Q(y, n) = -(-2 + 2*(1 - y) - 2*(1 - y)*Q(y, n - 1) + Q(y, n - 2)). A136202

a(n) = n*(n + 6). A28560

Numerator of 1/9 - 1/n². A61039

Vertex number of a square spiral in which the length of the first two edges are the legs of the primitive Pythagorean triple [3, 4, 5]. The edges of the spiral have length A195019. A195020

Numbers that can be expressed as the difference of the squares of primes in just one distinct way. A90781

a(n) = n*(7·n - 1)/2. A22264

Triangle of polynomial coefficients related to the series expansions of (1-x)^(-1-2·n/2). A161198