Properties of the Number 16405

Sixteen Thousand Four Hundred Five

Basics

Value: 16404 → 16405 → 16406

Parity: odd

Prime: No

Previous Prime: 16381

Next Prime: 16411

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 17 × 193

Divisors: 1, 5, 17, 85, 193, 965, 3281, 16405

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100000000010101

Octal: 40025

Duodecimal: 95B1

Hexadecimal: 4015

Square: 269124025

Square Root: 128.08200498118384

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) = ∑_{k, k∣n} 2^k-1. A34729

Partial sums of A213709. A218600

Number of connected induced (non-null) subgraphs of the friendship graph with 2n+1 nodes. A286186

Composite numbers k of the form 4u+1 for which the odd part of φ(k) divides k-1. A339870

Odd composite numbers k such that A053575(k) [the odd part of φ] divides k-1. A339880

Number of nX2 0..1 arrays with every element equal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero. A297937

a(n) = (-1)ⁿ⁺¹ * coefficient of xⁿ in ∑_k>=1 x^k/(1+2·x^k). A81295

Numbers in A152022 which are not products of terms of A152021. A152023

Sums of 4 distinct powers of 4. A38472

Sums of 5 distinct powers of 5. A38477