Properties of the Number -1642

Six Hundred Forty-Two

Basics

Value: -1643 → -1642 → -1641

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 821

Divisors: 1, 2, 821, 1642

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -11001101010

Octal: -3152

Duodecimal: -B4A

Hexadecimal: -66a

Square: 2696164

Square Root: 40.52159917870962

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 replicable function number 12c. A58491

McKay-Thompson series of class 12c for the Monster group with a(0) = -4. A186930

McKay-Thompson series of class 12c for the Monster group with a(0) = 4. A187045

McKay-Thompson series of class 24a for Monster. A58584

Triangular array from Steinbach matrices plus their squares as characteristic polynomials: M[i,j]=A[i,j]+A[i,j]²: A[i,j]²=Min[i,j]; CharacteristicPolynomial[M[i,j]];. A122073

a(n) = n² + n + 2. A14206

Number of compositions of n with at least one non-contiguous value. A335548

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

Composite and every divisor (except for 1) contains the digit 2. A62664

Semiprimes sandwiched between semiprimes. A86005