Properties of the Number 39866

Thirty-Nine Thousand Eight Hundred Sixty-Six

Basics

Value: 39865 → 39866 → 39867

Parity: even

Prime: No

Previous Prime: 39863

Next Prime: 39869

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 × 31 × 643

Divisors: 1, 2, 31, 62, 643, 1286, 19933, 39866

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1001101110111010

Octal: 115672

Duodecimal: 1B0A2

Hexadecimal: 9bba

Square: 1589297956

Square Root: 199.66471896657157

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

Number of 5-tuples of primes in arithmetic progression less than 10ⁿ. A115610

Pisot sequences E(5,7), P(5,7). A20711

Number of nX2 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. A317759

Pisot sequences E(7,10), P(7,10). A20721

Triangle read by rows: T(n,k) is the number of unlabeled digraphs on n nodes with k arcs up to reversing the arcs, k=0..n*(n-1). A126066

a(n) = floor(n*(n-1)*(n-2)*(n-3)/9). A11919

Numbers k such that 223·2^k+1 is prime. A32488

Numbers n such that σ(n+1)-σ(n) = -σ(n)/d(n), where d(n) denotes the number of divisors of n. A66177

Number of n X 3 integer arrays with each element equal to the number of horizontal and vertical neighbors differing from itself by exactly one. A266076

Number of unlabeled biconnected cubic simple graphs with 2n nodes. A387146