Properties of the Number 812

Eight Hundred Twelve

Basics

Value: 811 → 812 → 813

Parity: even

Prime: No

Previous Prime: 811

Next Prime: 821

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 7 × 29

Divisors: 1, 2, 4, 7, 14, 28, 29, 58, 116, 203

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1100101100

Octal: 1454

Duodecimal: 578

Hexadecimal: 32c

Square: 659344

Square Root: 28.495613697550013

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

Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1). A2378

Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n²/4). A2620

List of totally balanced sequences of 2n binary digits written in base 10. Binary expansion of each term contains n 0's and n 1's and reading from left to right (the most significant to the least significant bit), the number of 0's never exceeds the number of 1's. A14486

a(n) = n*φ(n). A2618

Balanced numbers: numbers k such that φ(k) (A000010) divides σ(k) (A000203). A20492

a(n) = 2·n*(2·n+1). A2943

Number of points on surface of cuboctahedron (or icosahedron): a(0) = 1; for n > 0, a(n) = 10n² + 2. Also coordination sequence for f.c.c. or A₃ or D₃ lattice. A5901

Primitive abundant numbers: abundant numbers (A005101) having no abundant proper divisor. A91191

a(n) = ∑_{1 <= i < j <= n} (j-i)³. A24166

Product of a prime and the previous number. A36689