Properties of the Number 6639

Six Thousand Six Hundred Thirty-Nine

Basics

Value: 6638 → 6639 → 6640

Parity: odd

Prime: No

Previous Prime: 6637

Next Prime: 6653

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 2213

Divisors: 1, 3, 2213, 6639

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1100111101111

Octal: 14757

Duodecimal: 3A13

Hexadecimal: 19ef

Square: 44076321

Square Root: 81.48005891014071

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 primes between n·100000 and (n+1)*100000. A38825

Numbers k such that k divides ∑_j=1..k j^j = A001923(k). A128981

Sum of the fourth largest parts in the partitions of n into 8 parts. A308995

Honaker's triangle problem: form a triangle with base of length n, all entries different, all row sums equal; a(n) gives minimal row sum. A47837

Number of compositions (ordered partitions) of n into square pyramidal numbers (A000330). A322340

Numbers k such that N = (35k)⁶ is a twin rank (A002822: 6N +- 1 are twin primes). A326235

Number of partitions of 5n such that cn(1,5) = cn(4,5) < cn(0,5) < cn(2,5) = cn(3,5). A36894

Numbers k such that prime(k) divides primorial(j) + 1 for exactly two integers j. A279099

Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + n, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences. A294546

a(n) is the smallest k such that A307092(k) = n. A307074