Properties of the Number 80140

Eighty Thousand One Hundred Forty

Basics

Value: 80139 → 80140 → 80141

Parity: even

Prime: No

Previous Prime: 80111

Next Prime: 80141

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 × 4007

Divisors: 1, 2, 4, 5, 10, 20, 4007, 8014, 16028, 20035

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011100100001100

Octal: 234414

Duodecimal: 3A464

Hexadecimal: 1390c

Square: 6422419600

Square Root: 283.0900916669462

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

a(n) is the number of nonnegative integers k less than 10ⁿ such that the decimal representation of k lacks at least one of digits 1,2, at least one of digits 3,4,5 and at least one of digits 6,7,8,9. A125946

T(n,k)=Number of nXk 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 3 neighboring 1s. A297607

Number of nX7 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 3 neighboring 1s. A297606

Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 3 neighboring 1s. A297609

Least positive integer multiples of angle·such that their direction cosines form a unit vector: ∑_k>0 cos(a(k)*x)² = 1, where a(1)=1 and x=2/3. A80140