Properties of the Number 23809

Twenty-Three Thousand Eight Hundred Nine

Basics

Value: 23808 → 23809 → 23810

Parity: odd

Prime: No

Previous Prime: 23801

Next Prime: 23813

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 29 × 821

Divisors: 1, 29, 821, 23809

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101110100000001

Octal: 56401

Duodecimal: 11941

Hexadecimal: 5d01

Square: 566868481

Square Root: 154.30165261590687

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

a(n) = (16/3)*(n+1)*n*(n-1) + 8·n² + 1. A212668

Numbers k such that ∑_i=1..k i⁶ divides ∏_i=1..k i⁶. A166606

Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2·n new points on the other two sides: sequence gives number of interior vertices in the resulting planar graph. A366484

n for which A079277(n) + φ(n) < n. A208815

a(n) = 12·a(n-1) + 7·a(n-2). A15611

Expansion of 1/((1-x)*(1-2·x)*(1-6·x)*(1-9·x)). A21194

Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of these n·k points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of internal vertices in the resulting planar graph. A367303

Xenodromes: all digits in base 15 are different. A23809

a(n) is equal to the number of positive integers m less than or equal to 10ⁿ such that m is not divisible by the prime 5 and is not divisible by at least one of the primes 2, 3 and 7. A128951

Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302220