Properties of the Number -18699

Eighteen Thousand Six Hundred Ninety-Nine

Basics

Value: -18700 → -18699 → -18698

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 23 × 271

Divisors: 1, 3, 23, 69, 271, 813, 6233, 18699

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100100100001011

Octal: -44413

Duodecimal: -A9A3

Hexadecimal: -490b

Square: 349652601

Square Root: 136.74428690076965

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

Expansion of ∏_k>=1 (1 + (x*(1 - x))^k). A307501

Numbers that are the sum of 3 positive 7th powers. A3370

Expansion of ∑_0<i<j<k<l q^i+j+k+l/( (1-qⁱ)*(1-q^j)*(1-q^k)*(1-q^l) )². A365664

a(1) = 1; a(n+1) = a(n) + (largest triangular number <= a(n)). A60985

Length of the shorts leg in the unique primitive Pythagorean triple whose inradius is A000032(n) and such that its long leg and its hypotenuse are consecutive natural numbers. A380821

a(n) = 2ⁿ + 3ⁿ + 4ⁿ. A74526

Indices of primes in tribonacci sequence A000073. A303263

Composite numbers k such that k*φ(k) is in A002378. A256545

a(n) = A014217(n+3) - A014217(n). A153263

Numbers that are the sum of at most 3 positive 7th powers. A4865