Properties of the Number 19999

Nineteen Thousand Nine Hundred Ninety-Nine

Basics

Value: 19998 → 19999 → 20000

Parity: odd

Prime: No

Previous Prime: 19997

Next Prime: 20011

Digit Sum: 37

Digital Root: 1

Palindrome: No

Factorization: 7 × 2857

Divisors: 1, 7, 2857, 19999

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111000011111

Octal: 47037

Duodecimal: B6A7

Hexadecimal: 4e1f

Square: 399960001

Square Root: 141.4178206592083

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

Smallest number whose sum of digits is n. A51885

Total number of smallest parts in all partitions of n into odd parts. A92268

a(n) = 2·10^n-1 - 1. A67272

Number of palindromes of length <= n. A70199

a(n) = 32·n² - 1. A158563

Bases in which 5 is a unique-period prime. A306074

a(n) is the smallest m such that for any N, at least one of S(N), S(N+1), ..., S(N+m-1) is divisible by n, where S(N) is the sum of digits of N. A331788

4-white numbers: partition digits of n⁴ into blocks of 4 starting at right; sum of these 4-digit numbers equals n. A37044

Concatenation of increasing number of alternating digits in base 2, starting with 1. A65760

a(n) = A066557(n)/n. A66558