Properties of the Number -406

Four Hundred Six

Basics

Value: -407 → -406 → -405

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 × 7 × 29

Divisors: 1, 2, 7, 14, 29, 58, 203, 406

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110010110

Octal: -626

Duodecimal: -29A

Hexadecimal: -196

Square: 164836

Square Root: 20.149441679609886

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

Coefficients of the '6th-order' mock θ function ψ(q). A53269

The q-exponential of x, E_q(x,q), evaluated at q=-x. A198197

a(n) = 1·2 - 3·4 + 5·6 - 7·8 + 9·10 - 11·12 + 13·14 - ... + (up to n). A319373

a(n) = 2·1 - 4·3 + 6·5 - 8·7 + 10·9 - 12·11 + 14·13 - 16·15 + ... - (up to the n-th term). A319885

Expansion of ∑_k>0 x^2·k/(1+x^k)³. A363022

a(n) = 3·a(n-1) - a(n-3) for n>2, with a(0)=1, a(1)=-1, a(2)=0. A122100

a(n) = -a(n-2) - a(n-3). A112455

Deleham triangle [1,1,-1,1,1,-1,1,...] δ [1,0,0,1,0,0,1,0,...], δ defined in A084938. A174014

Matrix inverse of triangle A121334, where A121334(n,k) = C( n*(n+1)/2 + n-k, n-k) for n>=k>=0. A121439

Coefficients in the expansion of B⁷/C, in Watson's notation of page 118. A160534