Properties of the Number -6639

Six Hundred Thirty-Nine

Basics

Value: -6640 → -6639 → -6638

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

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

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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

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 401", based on the 5-celled von Neumann neighborhood. A271806

Numerators of a recurrence relation arising in impact dynamics. A326176

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