Number: 18

Previous Number: 17
Next Number: 19
Absolute: 18
Sign: positive
Even or Odd: Even
Length: 2 digits (Significant Figures, Sig Fig)
Counter: -18
Inverse: 0.055555555555556
Reverse: 81 ; Palindromic: No
Half: 9
Double: 36
Undulating: Yes
Fibonacci: No
Fibonacci Prime: No
Evil or Odious: Evil
Lucas: Yes ; Previous: 11 ; Next: 29
Narcissistic: No
Pell: No
Octagonal: No
Centered Octagonal: No
Untouchable: No
AZ Alphabet Character: R
AZ Alphabet Character, Backwards: I
QWERTY Alphabet Character: K
QWERTY Alphabet Character, Backwards: O
Valid phone number (US)?: No
Valid SSN (US)?: No
Human Readable Size (Kilo: 1000): 18B
Human Readable Size (Kibi: 1024): 18B
UNIX Time Stamp: 1970-01-01 00:00:18
HTTP Status Code: Invalid
Digits in English (and NATO IPA): one eight
Digits in Morse Code: .---- ---..
Square Root: 4.2426406871193
Sine: -0.75098724677168
Cosine: 0.66031670824408
Tangent: -1.1373137123377
Inverse Tangent: 1.5152978215492
Secant: -1.3315805352205
Cosecant: 1.5144248017882
Cotangent: -0.87926487577869
Inverse Cotangent: 0.6599362750866
Roman Number: XVIII

Number: 18


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