Properties of the Number 18890

Eighteen Thousand Eight Hundred Ninety

Basics

Value: 18889 → 18890 → 18891

Parity: even

Prime: No

Previous Prime: 18869

Next Prime: 18899

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 5 × 1889

Divisors: 1, 2, 5, 10, 1889, 3778, 9445, 18890

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111001010

Octal: 44712

Duodecimal: AB22

Hexadecimal: 49ca

Square: 356832100

Square Root: 137.44089638822936

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

Sum of the squarefree parts of the partitions of n into 4 parts. A309479

Number of ways to place 4n nonattacking kings on an 8 X 2n cylindrical chessboard. A194646

Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and having k U=(1,2) steps among the steps leading to the first d step. A108441

Records in A353717. A353722

Number of ways to place 5n nonattacking kings on a vertical cylinder 10 X 2n. A195593

Index of prime(n) in A353709, or -1 if prime(n) does not appear in A353709. A353719

a(n) = sigma₃(n) - sigma₂(n) - sigma₁(n). A92350

Number of length-n binary words whose longest repeated suffix equals the longest repeated prefix. A327544

Numbers that cannot be expressed as the sum of one or more numbers without any repeated digits. A342080

T(n,k)=Number of nondecreasing arrangements of n numbers in -k..k with sum zero and sum of squares less than n·k*(k+1)/3. A183935