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Properties of the Number 18868

Eighteen Thousand Eight Hundred Sixty-Eight

Basics

Value: 18867 → 18868 → 18869

Parity: even

Prime: No

Previous Prime: 18859

Next Prime: 18869

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 2 × 53 × 89

Divisors: 1, 2, 4, 53, 89, 106, 178, 212, 356, 4717

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100110110100

Octal: 44664

Duodecimal: AB04

Hexadecimal: 49b4

Square: 356001424

Square Root: 137.3608386695422

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

T(n,k)=Number of (n+5)X(k+5) 0..1 matrices with each 6X6 subblock idempotent. A224577
Column 2 of triangle A055907. A55908
Numbers whose squares have 2R-1 digits, such that the number represented by leftmost R digits and number represented by rightmost R digits divide each other evenly. A216233
Number of (n+5)X6 0..1 matrices with each 6X6 subblock idempotent. A224570
Number of (n+5)X9 0..1 matrices with each 6X6 subblock idempotent. A224573
Number of (n+1) X (7+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings). A235288
Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 161", based on the 5-celled von Neumann neighborhood. A270452
Numbers k such that 145·2k+1 is prime. A32422
Least nonnegative integer which requires n letters to spell in Turkish excluding spaces and hyphens. A305100
T(n,k) is the number of (n+1) X (k+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant-stress 1 X 1 tilings). A235289