Properties of the Number 18390

Eighteen Thousand Three Hundred Ninety

Basics

Value: 18389 → 18390 → 18391

Parity: even

Prime: No

Previous Prime: 18379

Next Prime: 18397

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 613

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 613, 1226

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011111010110

Octal: 43726

Duodecimal: A786

Hexadecimal: 47d6

Square: 338192100

Square Root: 135.60973416388663

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

Third differences of fifth powers (A000584). A101096

T(n,k)=Number of length n+6 0..k arrays with no seven consecutive terms having the maximum of any three terms equal to the minimum of the remaining four terms. A249883

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with each row and column not divisible by 3, read as a binary number with top and left being the most significant bits. A263060

a(n) = A293518(n) - A293519(n); how many more surviving even nodes than surviving (but not bifurcating) odd nodes there are at generation n in the binary tree of persistently squarefree numbers. A293517

a(n) = 60·n² + 180·n + 150. A69477

Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A115216; by antidiagonals. A202868

a(n) is the least integer k such that k/Fibonacci(n) > e. A293675

G.f. satisfies: 7·A(x) = 6 + x + A(x)⁶, starting with [1,1,15]. A120600

Indices of records in A100695. A287636

Solution of the complementary equation a(n) = 2·a(n-1) - a(n-2) + b(n-1) + 3, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences. A294871