Properties of the Number 18942

Eighteen Thousand Nine Hundred Forty-Two

Basics

Value: 18941 → 18942 → 18943

Parity: even

Prime: No

Previous Prime: 18919

Next Prime: 18947

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 7 × 11 × 41

Divisors: 1, 2, 3, 6, 7, 11, 14, 21, 22, 33

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111111110

Octal: 44776

Duodecimal: AB66

Hexadecimal: 49fe

Square: 358799364

Square Root: 137.62993860348845

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

Principal diagonal of the convolution array A213819. A213820

a(n) = ∑_{k=1..prime(n)-1} floor(k³/prime(n)). A78837

Expansion of (1+4·x+x²)/((1+x)²*(1-x)⁵). A233329

Expansion of (1/x) * Series_Reversion( x / (1 + x³ / (1 - x)³) ). A389250

T(n,k) counts the set partitions of n containing k-1 blocks of length 1. A86659

a(n) = 11·n*(n+1). A164136

Number of connected regular simple graphs on n vertices with girth exactly 3. A186743

Triangle T(n, k) = the number of point-labeled graphs with n points and k edges, no points isolated, no edges isolated. By rows, 0 <= n, ceiling(2·n/3) <= k <= binomial(n, 2). A276640

G.f. satisfies A(x) = ( 1 + x·A(x)³ * (1 + x·A(x)) )². A371575

Number of magic labelings of the Petersen graph with magic sum n. A125196