Properties of the Number -638

Six Hundred Thirty-Eight

Basics

Value: -639 → -638 → -637

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 × 11 × 29

Divisors: 1, 2, 11, 22, 29, 58, 319, 638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1001111110

Octal: -1176

Duodecimal: -452

Hexadecimal: -27e

Square: 407044

Square Root: 25.25866188063018

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

Generalized Stirling number triangle of first kind read by rows: T(n, k) = [x^k] ∏_m=1..n (x - m - r), with r = 3. A49459

Triangle T(n,k) giving coefficients in expansion of n!*binomial(x-n,n) in powers of x. A54655

Expansion of ∏_m>=1 (1-m·q^m)²². A22682

Expansion of ∏_m>=1 (1+m·q^m)^-11. A22703

Inverse of a triangle of pyramidal numbers. A110814

G.f. A(x) satisfies: A(x) = 1 - ∑_k=1..4 (x·A(x))^k. A337513

Triangle of coefficients, read by row polynomials P_n(y), that satisfy the g.f.: A038497(x,y) = ∏_n>=1 1/(1-xⁿ)^[P_n(y)/n], with P_n(0)=0 for n>=1 and P₀(0)=1. A96797

McKay-Thompson series of class 24j for the Monster group. A112167

G.f. A(x) satisfies: A(x) = 1 - x·A(x/(1 - x)²) / (1 - x)². A351659

Riordan array (1/(1+2x), x/(1+x)). A103316