Properties of the Number 1822

One Thousand Eight Hundred Twenty-Two

Basics

Value: 1821 → 1822 → 1823

Parity: even

Prime: No

Previous Prime: 1811

Next Prime: 1823

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 911

Divisors: 1, 2, 911, 1822

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11100011110

Octal: 3436

Duodecimal: 107A

Hexadecimal: 71e

Square: 3319684

Square Root: 42.68489194082609

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

Number of knapsack partitions of n. A108917

Number of integer partitions of n whose distinct parts are connected. A304716

Partial sums of A001157: ∑_j=1..n sigma₂(j). A64602

Semiprimes of form prime - 1. A77065

Number of locally disjoint rooted identity trees with n nodes, meaning no branch overlaps any other branch of the same root. A316471

a(0) = 1; a(n) = (5·3^n-1 - 1)/2 for n > 0. A60816

Square array of numbers A(n,k) (n>=0, k>=0) of transitive reflexive early confluent binary relations R on n labeled elements where |{y : xRy}| <= k for all x, read by antidiagonals. A135302

Number of integer partitions of n with one fewer distinct multiplicities than distinct parts. A325244

Start with a single triangle; at n-th generation add a triangle at each vertex, allowing triangles to overlap; sequence gives total population of triangles at n-th generation. A61777

T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 nXk array. A219714