Properties of the Number 1999

One Thousand Nine Hundred Ninety-Nine

Basics

Value: 1998 → 1999 → 2000

Parity: odd

Prime: Yes

Previous Prime: 1997

Next Prime: 2003

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 1999

Divisors: 1, 1999

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11111001111

Octal: 3717

Duodecimal: 11A7

Hexadecimal: 7cf

Square: 3996001

Square Root: 44.710177812216315

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

Primes having only {1, 2, 9} as digits. A385776

Centered triangular numbers: a(n) = 3·n*(n-1)/2 + 1. A5448

Smallest number whose sum of digits is n. A51885

Total number of ON states after n generations of cellular automaton based on hexagons. A151723

Expansion of (1/(1-x²))*∏_m>=0 1/(1-x^2m+1). A38348

Primes having only {0, 1, 9} as digits. A199329

Primes of the form 16n+15. A127576

Number of planar partitions of n where parts strictly decrease along each row and column. A114736

Prime numbers == 1 (mod 9). A61237

Primes of the form 4x²-4xy+7y², with·and y nonnegative. A107006

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