Properties of the Number 7140

Seven Thousand One Hundred Forty

Basics

Value: 7139 → 7140 → 7141

Parity: even

Prime: No

Previous Prime: 7129

Next Prime: 7151

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 7 × 17

Divisors: 1, 2, 3, 4, 5, 6, 7, 10, 12, 14

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: Yes

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Representations

Binary: 1101111100100

Octal: 15744

Duodecimal: 4170

Hexadecimal: 1be4

Square: 50979600

Square Root: 84.49852069711044

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

Tetrahedral (or triangular pyramidal) numbers: a(n) = C(n+2,3) = n*(n+1)*(n+2)/6. A292

a(n) = 2·n*(2·n+1). A2943

Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n*(n+1)*(n-1)*(n-2)/8. A50534

a(n + 3) = 35·a(n + 2) - 35·a(n + 1) + a(n), with a(0) = 0, a(1) = 6, a(2) = 210. A29549

Denominators of Cauchy numbers of first type. A6233

Sum of the first n even squares: a(n) = 2·n*(n+1)*(2·n+1)/3. A2492

Dodecahedral numbers: a(n) = n*(3·n - 1)*(3·n - 2)/2. A6566

Multiples of 14 containing a 14 in their decimal representation. A121034

12 times triangular numbers. A49598

Ordered areas of primitive Pythagorean triangles. A24406