ℕ atory
Play Now

Properties of the Number 18630

Eighteen Thousand Six Hundred Thirty

Basics

Value: 18629 → 18630 → 18631

Parity: even

Prime: No

Previous Prime: 18617

Next Prime: 18637

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 4 × 5 × 23

Divisors: 1, 2, 3, 5, 6, 9, 10, 15, 18, 23

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100100011000110

Octal: 44306

Duodecimal: A946

Hexadecimal: 48c6

Square: 347076900

Square Root: 136.49175799292792

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

Diagonal in array of n-gonal numbers A081422. A81435
Triangle read by rows: T(n, k) = t(n-k, k), where t(0,0) = 1, t(n,m) = 0 if n < 0 or m < 0, else t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), and f(n) = 6·n + 3. A257625
a(n) = 3·2*1 - 6·5*4 + 9·8*7 - 12·11·10 + 15·14·13 - 18·17·16 + ... - (up to the n-th term). A319886
Number of general plane trees whose n-th subtree from the left is equal to the n-th subtree from the right, for all its subtrees (i.e., are palindromic in the shallow sense). A73192
Numbers n such that σ(n) = 11*φ(n) (where σ=A000203, φ=A000010). A171257
Irregular array T(n,k) of the numbers of non-extendable (complete) non-self-adjacent simple paths incorporating each of a minimal subset of nodes within a square lattice bounded by rectangles with nodal dimensions n and 4, n >= 2. A214510
Number of compositions of n such that the set s of parts and multiplicities satisfies s = {1..max(s)}. A335942
Balanced numbers (A020492) that are not arithmetic numbers (A003601). A342104
Indices m such that A128646(m)-1 is prime, where A128646 = denominator of partial sums of 1/(p(i)-1). A137689
a(n) = 18*(n - 2)*(2·n - 5). A60787