Properties of the Number 7240

Seven Thousand Two Hundred Forty

Basics

Value: 7239 → 7240 → 7241

Parity: even

Prime: No

Previous Prime: 7237

Next Prime: 7243

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 5 × 181

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 181, 362

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1110001001000

Octal: 16110

Duodecimal: 4234

Hexadecimal: 1c48

Square: 52417600

Square Root: 85.0881895447306

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) = (19ⁿ-1)/18. A218722

a(n) = n³ + n² + n + 1. A53698

Triangle read by rows giving T(n,k) = number of inequivalent indecomposable linear [ n,k ] binary codes without 0 columns (n >= 2, 1 <= k <= n). A34254

Riordan array (1/(1 + 5·x + x²), x/(1 + 5·x + x²))^-1; inverse of Riordan array A123967. A125906

Numbers n such that the decimal expansions of both n and n² have 0 as smallest digit and 7 as largest digit. A256634

Square array A(n,k) = A017665(A246278(n,k)), read by falling antidiagonals; numerator of the abundancy index as applied onto prime shift array A246278. A341605

Number of subsets of {1..n} such that it is not possible to choose a different binary index of each element. A370637

Triangle of Gaussian binomial coefficients [ n,k ] for q = 19. A22183

Number of partitions of n into parts without powers of 2. A101417

Sum of divisors of cubes. A175926