Properties of the Number 40857

Forty Thousand Eight Hundred Fifty-Seven

Basics

Value: 40856 → 40857 → 40858

Parity: odd

Prime: No

Previous Prime: 40853

Next Prime: 40867

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 13619

Divisors: 1, 3, 13619, 40857

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1001111110011001

Octal: 117631

Duodecimal: 1B789

Hexadecimal: 9f99

Square: 1669294449

Square Root: 202.1311455466475

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 k² * 2^k - 1 is prime. A58781

Expansion of (1 - x - x² - sqrt(1 - 2·x - 5·x² - 2·x³ + x⁴)) / (2·x + 2·x²). A78481

Floor( φ * (3/2)ⁿ ) where φ = (1+sqrt(5))/2. A81226

Numbers k such that the sum of first k Catalan numbers is a prime. A134775

Expansion of g/(1 + x³*g³), where g = 1+x·g³ is the g.f. of A001764. A387679

Numbers k such that either k²*2^k-1 or k²*2^k+1 is prime, but not both. A237759

Nicomachus triangle read by rows, T(n, k) = 2^{n - k}*3^k, for 0 <= k <= n. A36561

Continued fraction for sqrt(887). A40857

Triangle read by rows: T(n,k) is the number of permutations of{1,2,...,n} avoiding [x,x+1] having genus k (see first comment for definition of genus). A218538