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Properties of the Number -18904

Eighteen Thousand Nine Hundred Four

Basics

Value: -18905 → -18904 → -18903

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 3 × 17 × 139

Divisors: 1, 2, 4, 8, 17, 34, 68, 136, 139, 278

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100100111011000

Octal: -44730

Duodecimal: -AB34

Hexadecimal: -49d8

Square: 357361216

Square Root: 137.4918179383777

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

Numbers k whose abundance σ(k) - 2·k = -8. Numbers k whose deficiency is 8. A125247
Even and odd solutions to abs(σ(x)-2x) <= log(x). Numbers n whose abundance-radius does not exceed log(n). A88011
Deficient-perfect numbers: Deficient numbers n such that n/(2n-σ(n)) is an integer. A271816
Numbers k such that σ(k) == 0 (mod k-4). A274554
Number of non-associative non-commutative closed binary operations on a set of order n. A79192
Near-multiperfects with primes, powers of 2 and 6·prime excluded, abs(σ(n) mod n) <= log(n). A117349
Near-multiperfects with primes, powers of 2, 6·prime and 2n * prime excluded, abs(σ(n) mod n) <= log(n). A117350
Near-multiperfects with primes excluded, abs(σ(m) mod m) <= log(m). A117347
Numbers k such that k + σ(k) + φ(k) is a fourth power. A116007
Numbers k such that k + σ(k) + φ(k) is a square. A116009