Properties of the Number 39969

Thirty-Nine Thousand Nine Hundred Sixty-Nine

Basics

Value: 39968 → 39969 → 39970

Parity: odd

Prime: No

Previous Prime: 39953

Next Prime: 39971

Digit Sum: 36

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 4441

Divisors: 1, 3, 9, 4441, 13323, 39969

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1001110000100001

Octal: 116041

Duodecimal: 1B169

Hexadecimal: 9c21

Square: 1597520961

Square Root: 199.92248497855363

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) = ∑_k=0..n binomial(4·n+2·k+2,n-k). A390473

Triangle read by rows, T(n, k) = ∑_j=0..k |Stirling1(n, j)|. A349782

Expansion of log(1+x)*exp(tan(x)). A9419

Numbers n such that 49·2ⁿ-1 is prime. A50550

Harmonic mean of digits is 6. A62184

An example of a d-perfect sequence: a(n) = Catalan(n) mod 3. A39969

Number of ways to place 4 nonattacking knights on an n X n toroidal board. A172531

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 2 5 6 or 7. A252507

Number of (n+1)X(6+1) arrays of permutations of 0..n·7+6 with each element having directed index change 0,0 0,1 1,0 or -1,-2. A264283