Properties of the Number 81400

Eighty-One Thousand Four Hundred

Basics

Value: 81399 → 81400 → 81401

Parity: even

Prime: No

Previous Prime: 81373

Next Prime: 81401

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 5 ² × 11 × 37

Divisors: 1, 2, 4, 5, 8, 10, 11, 20, 22, 25

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011110111111000

Octal: 236770

Duodecimal: 3B134

Hexadecimal: 13df8

Square: 6625960000

Square Root: 285.3068523537421

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 sublattices of index n in generic 4-dimensional lattice. A38991

a(n) = 1 + prime(n) + prime(n)² + prime(n)³. A131991

a(n) = (43ⁿ - 1)/42. A218746

The sum of divisors of the smallest cubefull number that is a multiple of n. A369720

The Wiener index of the P₃ X P_n grid, where P_m is the path graph on m nodes. The Wiener index of a connected graph is the sum of distances between all unordered pairs of nodes in the graph. A180569

The sum of divisors of the smallest cubefull exponentially odd number that is divisible by n. A369758

The sum of the divisors of the smallest cube divisible by n. A390663

Totient numbers (A002202) of the form 1 + k + k² + k³ +...+ kⁱ (i > 1, k > 1). A282090

a(n) = d(n) - bigomega(n) - A005361(n). A81400