Properties of the Number 26405

Twenty-Six Thousand Four Hundred Five

Basics

Value: 26404 → 26405 → 26406

Parity: odd

Prime: No

Previous Prime: 26399

Next Prime: 26407

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 5281

Divisors: 1, 5, 5281, 26405

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110011100100101

Octal: 63445

Duodecimal: 13345

Hexadecimal: 6725

Square: 697224025

Square Root: 162.49615380063616

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

Numbers n such that φ(n)=2*φ(n-1). A171271

Consider a 2-D cellular automaton generated by the Schrandt-Ulam rule of A170896, but confined to a semi-infinite strip of width n, starting with one ON cell at the top left corner; a(n) is the period of the resulting structure. A6447

Shifts 3 places left under exponentiation. A7548

a(n) = p² - p - 1 where p = prime(n), the n-th prime. A306190

Smallest k>1 such that k(p-1)-1 is divisible by p², p=n-th prime. A39914

Numbers k such that C(k+2,2) divides 2^k+1 - 1. A246636

a(n+1) = a(n) converted to base 8 from base 7 (written in base 10). A23388

Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x. A48131

Nonzero numerators in asymptotic expansion of the Riemann-Seigel Z-function. A50276

p²-p-1 that is not prime, where p is prime. A119609