Properties of the Number 81408

Eighty-One Thousand Four Hundred Eight

Basics

Value: 81407 → 81408 → 81409

Parity: even

Prime: No

Previous Prime: 81401

Next Prime: 81409

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ⁹ × 3 × 53

Divisors: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111000000000

Octal: 237000

Duodecimal: 3B140

Hexadecimal: 13e00

Square: 6627262464

Square Root: 285.3208720020321

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

Expansion of 1/(1-2·x+2·x³). A77940

Expansion of 1/(1+2·x-2·x³). A77988

Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 361", based on the 5-celled von Neumann neighborhood. A281413

Expansion of (1-2·x)/(1-2·x+2·x³). A124395

2nd row of A341867: a(n) = (n²+15·n+32)*2^n-3. A343561

Triangle related to generalized Catalan numbers A064340. A67327

Binomial transform, alternating in sign, of Lucas generalized numbers S(n): S(n) = S(n-1) + S(n-2) + S(n-3), S(0)=3, S(1)=1, S(2)=3. A73314

Numbers k such that sum(d∣k, σ(d)²/d) is an integer, where d are the divisors of k. A226564

a(n) = (n+1)*a(n-5), with a(0)=a(1)=a(2)=a(3)=a(4)=1. A81408

The hyper-Wiener index of the nanostar dendrimer NS[n], defined pictorially in the Ashrafi et al. reference. A216123