Properties of the Number 1812

One Thousand Eight Hundred Twelve

Basics

Value: 1811 → 1812 → 1813

Parity: even

Prime: No

Previous Prime: 1811

Next Prime: 1823

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 151

Divisors: 1, 2, 3, 4, 6, 12, 151, 302, 453, 604

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 11100010100

Octal: 3424

Duodecimal: 1070

Hexadecimal: 714

Square: 3283344

Square Root: 42.567593307585526

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

Triangle read by rows: T(n,k) = ∑_j>=0 j!*T(n-j-1, k-1) for n >= 0, k >= 0. A84938

Number of partitions of n with equal number of even and odd parts. A45931

a(n) = ∑_k=0..n k!*(n - k)!. A3149

Numbers n such that n³² + 1 is prime. A6315

Multiples of 12 containing a 12 in their decimal representation. A121032

Indices n such that A019328(n) = φ(n,10) is prime, where φ is a cyclotomic polynomial. A138940

Number A(n,k) of semistandard Young tableaux over all partitions of n with maximal element <= k; square array A(n,k), n>=0, k>=0, read by antidiagonals. A210391

Indices k such that A020509(k)=φ[k](-10) is prime, where φ is a cyclotomic polynomial. A138920

Numbers m such that there are precisely 15 groups of order m. A294156

Numbers k whose largest divisor <= sqrt(k) equals 12. A162532