Properties of the Number -1405

Four Hundred Five

Basics

Value: -1406 → -1405 → -1404

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 5 × 281

Divisors: 1, 5, 281, 1405

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: -10101111101

Octal: -2575

Duodecimal: -991

Hexadecimal: -57d

Square: 1974025

Square Root: 37.48332962798263

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

Row sums of a number triangle related to the Pell numbers. A110331

E.g.f. A(x) satisfies: (A(x)³ - 6·x)² = (2 - A(x)²)³. A249785

McKay-Thompson series of class 30A for the Monster group with a(0) = -3. A205826

G.f. A(x) satisfies: x = 1 - A(x) - A(x)³ + A(x)⁵. A295543

McKay-Thompson series of class 30A for Monster. A58612

Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A202875; by antidiagonals. A202877

Dirichlet g.f.: ζ(s) / (ζ(s-1) * ζ(s-2)). A351654

Expansion of ∏_k>=2 (1 - x^k)^k. A298599

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

a(n) = n + (n+1)². A28387