Properties of the Number 7947

Seven Thousand Nine Hundred Forty-Seven

Basics

Value: 7946 → 7947 → 7948

Parity: odd

Prime: No

Previous Prime: 7937

Next Prime: 7949

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 883

Divisors: 1, 3, 9, 883, 2649, 7947

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111100001011

Octal: 17413

Duodecimal: 4723

Hexadecimal: 1f0b

Square: 63154809

Square Root: 89.14594774862175

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

Numbers k such that 6^k+5^k-1 is prime. A93765

Number of subsets of {1..n} whose greatest element cannot be written as a (strictly) positive linear combination of the others. A365044

Composite numbers k such that A075254(k) is a square. A386246

Card-matching numbers (Dinner-Diner matching numbers). A59060

Number of partitions of n such that there is exactly one part which occurs three times, while all other parts occur only once. A265251

a(n) = ∑_i=1..n φ(i)*φ(i+1), where φ(n) = A000010(n) is Euler's totient function. A330319

Expansion of ∏_m>=1 1/(1 - m·q^m)⁹. A22733

Composite numbers whose prime factors contain no digits other than 3 and 8. A36317

Becomes prime or 4 after exactly 8 iterations of f(x) = sum of prime factors of x. A48130

Number of permutations of length n which avoid the patterns 312, 1324, 3421; or avoid the patterns 312, 1324, 2341, etc. A116722