Properties of the Number 1804

One Thousand Eight Hundred Four

Basics

Value: 1803 → 1804 → 1805

Parity: even

Prime: No

Previous Prime: 1801

Next Prime: 1811

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 11 × 41

Divisors: 1, 2, 4, 11, 22, 41, 44, 82, 164, 451

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11100001100

Octal: 3414

Duodecimal: 1064

Hexadecimal: 70c

Square: 3254416

Square Root: 42.473521163190604

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

a(n) = n*(n+3). A28552

Numbers k for which 10k+1, 10k+3, 10k+7 and 10k+9 are primes. A7811

Numbers k such that k⁶⁴ + 1 is prime. A6316

a(n) = n * σ(A003961(n)), where A003961 shifts the prime factorization of n one step towards larger primes, and σ is the sum of the divisors of n. A341528

Numbers k such that the geometric mean of φ(k) and σ(k) is an integer. A11257

Numbers m such that there are precisely 11 groups of order m. A249554

Triangle read by rows: T(n,k) = number of vertices in a "frame" of size n X k (see Comments in A331457 for definition). A332599

Total number of largest parts in all partitions of n into odd parts. A92311

Numbers n such that 1 + n + n³ + n⁵ + n⁷ + n⁹ + n¹¹ + n¹³ + n¹⁵ + n¹⁷ + n¹⁹ + n²¹ + n²³ is prime. A124181

a(n) = 2·n² + 4. A255843