Properties of the Number 18123

Eighteen Thousand One Hundred Twenty-Three

Basics

Value: 18122 → 18123 → 18124

Parity: odd

Prime: No

Previous Prime: 18121

Next Prime: 18127

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 × 863

Divisors: 1, 3, 7, 21, 863, 2589, 6041, 18123

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011011001011

Octal: 43313

Duodecimal: A5A3

Hexadecimal: 46cb

Square: 328443129

Square Root: 134.621692159919

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

Numbers m such that 3·2^m - 1 is prime. A2235

Number T(n,k) of proper k-times partitions of n; triangle T(n,k), n >= 0, 0 <= k <= max(0,n-1), read by rows. A327639

Number of ways to write n as an ordered sum of 7 nonzero decimal palindromes. A341204

a(n) = ∑_i=0..n digsum₈(i)⁴, where digsum₈(i) = A053829(i). A231683

Let y = y(u,v) be implicitly defined by g(u,v,y(u,v)) = 0. Read as a triangle by rows k = 1,2,..., the sequence represents the number of terms a(i,k-i) in the expansion of the partial derivatives d^k y/duⁱ dv^k-i in terms of partial derivatives of g. A172004

Number of 0..3 arrays x(0..n-1) of n elements with nondecreasing average value and 0..3 occur with instance counts within one of each other. A200939

Number of Dyck n-paths all of whose ascents and descents have lengths equal to 1 (mod 8). A212367

Position of start of first appearance of n consecutive 1's in the binary expansion of π. A178709

Numbers k such that 43^k + 4 is prime. A230433

Numbers k such that (k·2^d - 1)*(d·2^k - 1) is semiprime for some divisor d of k. A382646

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