Properties of the Number 16805

Sixteen Thousand Eight Hundred Five

Basics

Value: 16804 → 16805 → 16806

Parity: odd

Prime: No

Previous Prime: 16787

Next Prime: 16811

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 3361

Divisors: 1, 5, 3361, 16805

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100000110100101

Octal: 40645

Duodecimal: 9885

Hexadecimal: 41a5

Square: 282408025

Square Root: 129.634100452003

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) = least k such that the remainder when 23^k is divided by k is n. A128363

Expansion of 1/(1 - x*∏_k>=1 (1 + x^k)/(1 - x^k)). A299108

Number of partitions of n such that all parts, with the possible exception of the smallest, appear only once. A115029

Positive integers n such that 7ⁿ == 2 (mod n). A277401

Monotonic ordering of nonnegative differences 7ⁱ-2^j, for 40>=i>=0, j>=0. A192119

Number of terms k such that difference between halving and tripling steps in Collatz (3x+1) trajectory of k is n. A213678

a(n) = 2ⁿ + 2·n² + 2·n + 1. A321123

Numbers whose concatenation of prime factors (with multiplicity) is a square. A38693

Numbers whose base-7 representation contains exactly four 6's. A43420

a(n) = (2ⁿ - 1)⁵ - 2. A98879