Properties of the Number 8405

Eight Thousand Four Hundred Five

Basics

Value: 8404 → 8405 → 8406

Parity: odd

Prime: No

Previous Prime: 8389

Next Prime: 8419

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 41 ²

Divisors: 1, 5, 41, 205, 1681, 8405

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10000011010101

Octal: 20325

Duodecimal: 4A45

Hexadecimal: 20d5

Square: 70644025

Square Root: 91.67878707749138

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) = 5·n². A33429

Numbers m such that there are precisely 7 groups of order m. A249550

Numbers k such that k | 4^k + 1. A15950

Least number starting a chain of exactly 2n-1 consecutive integers that do not have totient inverses. A63512

Numbers k such that σ(k) = ψ(k) + τ(k). A387953

Numbers whose square can be represented in exactly two ways as the sum of a positive square and a positive fourth power. A345700

Sum of all terms on the two principal diagonals of a 2n+1 X 2n+1 square spiral. A114254

Numbers that are multiple-digit narcissistic numbers in exactly three bases. A256362

Number of integer partitions of n such that the maximum is greater than twice the median. A361857

Least positive integer k such that prime(k·n)+2 = prime(i·n)*prime(j·n) for some 0 < i < j. A257926