Properties of the Number 2405

Two Thousand Four Hundred Five

Basics

Value: 2404 → 2405 → 2406

Parity: odd

Prime: No

Previous Prime: 2399

Next Prime: 2411

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 5 × 13 × 37

Divisors: 1, 5, 13, 37, 65, 185, 481, 2405

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101100101

Octal: 4545

Duodecimal: 1485

Hexadecimal: 965

Square: 5784025

Square Root: 49.040799340956916

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) = 4*(n+1)*n + 5. A78370

a(n) = n² + 4. A87475

Numbers whose base-2 representation is the juxtaposition of two identical strings. A20330

Least k such that the decimal representation of k·n contains only 1's and 0's. A79339

Numbers whose binary expansion is properly periodic. A121016

Numbers m that are the hypotenuse of exactly 13 distinct integer-sided right triangles, i.e., m² can be written as a sum of two squares in 13 ways. A97102

Total number of toothpicks in the toothpick structure A139250 that are parallel to the initial toothpick, after n odd rounds. A162795

Sum of first k numbers in column k of the natural number array A000027; by antidiagonals. A185787

Heinz numbers of integer partitions with the same product of parts as their conjugate. A325040

Integer part of decimal 'base-2 looking' numbers divided by their actual base-2 values (denominator of a(n) is n, numerator is n written in binary but read in decimal). A32532