Properties of the Number 1642

One Thousand Six Hundred Forty-Two

Basics

Value: 1641 → 1642 → 1643

Parity: even

Prime: No

Previous Prime: 1637

Next Prime: 1657

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

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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

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

Number of representations of n as a sum of products of pairs of integers larger than 1, considered to be equivalent when terms or factors are reordered. A182270

T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A303197

T(n,k) = Number of permutations of 0..floor((n·k-2)/2) on odd squares of an n X k array such that each row, column, diagonal and (downwards) antidiagonal of odd squares is increasing. A215870

Number of (undirected) Hamiltonian paths in the n-ladder graph K₂ X P_n. A3682

Numbers k such that k⁹ is an interprime = average of two successive primes. A75232