Properties of the Number 81404

Eighty-One Thousand Four Hundred Four

Basics

Value: 81403 → 81404 → 81405

Parity: even

Prime: No

Previous Prime: 81401

Next Prime: 81409

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 47 × 433

Divisors: 1, 2, 4, 47, 94, 188, 433, 866, 1732, 20351

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110111111100

Octal: 236774

Duodecimal: 3B138

Hexadecimal: 13dfc

Square: 6626611216

Square Root: 285.31386226399866

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 points in Nⁿ of norm <= 3. A55418

Numbers k such that k² contains only digits {1,2,6}. A53882

a(n) = A008475(prime(n)-1). A81404

Number of nX4 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. A281650