Properties of the Number 1819

One Thousand Eight Hundred Nineteen

Basics

Value: 1818 → 1819 → 1820

Parity: odd

Prime: No

Previous Prime: 1811

Next Prime: 1823

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 17 × 107

Divisors: 1, 17, 107, 1819

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11100011011

Octal: 3433

Duodecimal: 1077

Hexadecimal: 71b

Square: 3308761

Square Root: 42.649736224272246

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

Generalized 14-gonal numbers: m*(6·m-5), m = 0,+1,-1,+2,-2,+3,-3,... A195818

a(n) = (3·n² - n - 2)/2. A115067

a(n) = n concatenated with n + 1. A1704

Number of partitions of n into aliquant parts (i.e., parts that do not divide n). A98743

Numbers k such that the largest prime factor of k²-1 is 101. A181568

In the '3x+1' problem, these values for the starting value set new records for highest point of trajectory before reaching 1. A6884

Number of subsets of {1..n} whose cardinality cannot be written as a nonnegative linear combination of the elements. A367223

Number of fully normal integer partitions of n. A317491

Number of semi-sums of integer partitions of n. A366738

Convolution of Fibonacci numbers 1,2,3,5,... with themselves. A4798