Properties of the Number -2638

Six Hundred Thirty-Eight

Basics

Value: -2639 → -2638 → -2637

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 1319

Divisors: 1, 2, 1319, 2638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -101001001110

Octal: -5116

Duodecimal: -163A

Hexadecimal: -a4e

Square: 6959044

Square Root: 51.36146415358503

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

Square array read by ascending antidiagonals, complementary Bell numbers iterated by the Bell transform. A265313

Number of ways to write n as an orderless product of orderless sums. A318949

Semiprimes with prime sum of factors: twice the lesser of the twin prime pairs. A108605

Expansion of 1/(1 - ∑_k>=1 μ(k)²*x^k), where μ(k) is the Moebius function (A008683). A280194

Number of compositions of n into 4 ordered relatively prime parts. A742

Numbers k such that lcm(1,2,3,...,k)/5 equals the denominator of the k-th harmonic number H(k). A112814

Triangle of the RBS1 polynomial coefficients. A160485

Numbers whose least quadratic nonresidue (A020649) is 13. A25025

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order. A253044

Number of ways to choose an integer partition of each factor in a factorization of n. A318948