Properties of the Number -12643

Twelve Thousand Six Hundred Forty-Three

Basics

Value: -12644 → -12643 → -12642

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 47 × 269

Divisors: 1, 47, 269, 12643

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -11000101100011

Octal: -30543

Duodecimal: -7397

Hexadecimal: -3163

Square: 159845449

Square Root: 112.44109569014347

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 4-almost primes f such that 2ⁿ < f <= 2ⁿ⁺¹. A120035

Centered 14-gonal numbers. A69127

Number of partitions in parts not of the form 15k, 15k+1 or 15k-1. Also number of partitions with no part of size 1 and differences between parts at distance 6 are greater than 1. A35955

Take pairs (x,y) with ∑_{j = x..y} j = concatenation of·and y. Sort pairs on y then x. This sequence gives·of each pair. A70152

a(0) = 0, a(1) = 1. For n >= 2, a(n) = a(n-1)/(n-1) if n-1 divides a(n-1); otherwise, a(n) = a(n-1) + a(n-2). A343376

Numbers m such that Stern polynomial B(m,x) has no irreducible polynomial factors that themselves are Stern polynomials. The initial a(1) = 1 is included by convention. A389918

Numbers k such that the sum of digits³ of k equals ∑_{d∣k, 1<d<k} d. A202279

Record values in A180076. A180080

Numbers n such that A003145(n) = floor(α²*n)+1, where α = 1.839... is the positive real zero of x³-x²-x-1. A278352

Composite numbers k such that k-1 divides 2^k-2. A330382