Properties of the Number 81402

Eighty-One Thousand Four Hundred Two

Basics

Value: 81401 → 81402 → 81403

Parity: even

Prime: No

Previous Prime: 81401

Next Prime: 81409

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 13567

Divisors: 1, 2, 3, 6, 13567, 27134, 40701, 81402

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011110111111010

Octal: 236772

Duodecimal: 3B136

Hexadecimal: 13dfa

Square: 6626285604

Square Root: 285.3103573303991

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 length n+5 0..k arrays with no six consecutive terms having two times the sum of any two elements equal to the sum of the remaining four. A249233

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A237936

Number of (n+1)X(1+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A237931

Number of (n+1)X(4+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A237934

Number of length n+5 0..6 arrays with no six consecutive terms having two times the sum of any two elements equal to the sum of the remaining four. A249231

Number of length 1+5 0..n arrays with no six consecutive terms having two times the sum of any two elements equal to the sum of the remaining four. A249234

Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 4 X 4 X 4 subtriangle. A153904

a(n) = A008475(n!). A81402