Properties of the Number 23921

Twenty-Three Thousand Nine Hundred Twenty-One

Basics

Value: 23920 → 23921 → 23922

Parity: odd

Prime: No

Previous Prime: 23917

Next Prime: 23929

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 19 × 1259

Divisors: 1, 19, 1259, 23921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101110101110001

Octal: 56561

Duodecimal: 11A15

Hexadecimal: 5d71

Square: 572214241

Square Root: 154.6641522784126

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

Number of distinct regions among all circles that can be constructed on vertices of an n-sided regular polygon, using only a compass. A359046

a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = a(2) = 1 and a(3) = 2. A49890

Coefficient of·in the reduction by (x² -> x + 1) of the polynomial p(n,x) defined below at Comments. A192905

Number of 10-element subsets of [n] whose sum is a triangular number. A320856

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 33", based on the 5-celled von Neumann neighborhood. A269812

Number of partitions satisfying cn(0,5) <= cn(2,5) + cn(3,5). A39840

θ series of A*_9 lattice. A23921