Properties of the Number -1778

Seven Hundred Seventy-Eight

Basics

Value: -1779 → -1778 → -1777

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 7 × 127

Divisors: 1, 2, 7, 14, 127, 254, 889, 1778

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -11011110010

Octal: -3362

Duodecimal: -1042

Hexadecimal: -6f2

Square: 3161284

Square Root: 42.16633728461603

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

G.f. A(x) satisfies: [xⁿ⁺¹] A(Fⁿ(x)) = 0 for n>0 where Fⁿ(x) denotes the n-th iteration of F(x) = x+x² with F⁰(x)=x. A187009

Coefficient of q²ⁿ in the series expansion of Ramanujan's mock θ function f(q). A39

a(n) = A000730(7·n). A282941

Numerator of Hermite(n, 6/31). A160304

a(n) = least k >= 1 such that the remainder when 6^k is divided by k is n. A127816

Numbers that are the sum of 7 positive 6th powers. A3363

Preperiod (or threshold) of orbit of Post's {00, 1101} tag system applied to the word (100)ⁿ, or -1 if this word has an unbounded trajectory. A284119

Shifts 2 places left when convolved with itself. A7477

Sum of first n nonprimes. A51349

Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m·k + 1)*T(n-1, k, m) + m·f(n,k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1, f(n, k) = 2·k+1 if k <= floor(n/2) otherwise 2*(n-k)+1, and m = 1, read by rows. A157272