Properties of the Number 842

Eight Hundred Forty-Two

Basics

Value: 841 → 842 → 843

Parity: even

Prime: No

Previous Prime: 839

Next Prime: 853

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 421

Divisors: 1, 2, 421, 842

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101001010

Octal: 1512

Duodecimal: 5A2

Hexadecimal: 34a

Square: 708964

Square Root: 29.017236257093817

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 + 1. A2522

a(n) = sigma₂(n): sum of squares of divisors of n. A1157

List of totally balanced sequences of 2n binary digits written in base 10. Binary expansion of each term contains n 0's and n 1's and reading from left to right (the most significant to the least significant bit), the number of 0's never exceeds the number of 1's. A14486

a(n) = ∑_d∣n (-1)^d-1*d². A321543

Numbers k such that k!! - 1 is prime. A7749

Quarter-squares plus 1 (that is, a(n) = A002620(n) + 1). A33638

a(n) = a(n-1) + a(n-2) + 1, with a(0) = 0 and a(1) = 2. A1610

Numbers obtained by reinterpreting base-2 representation of n in the factorial base: a(n) = ∑_k>=0 A030308(n,k)*A000142(k+1). A59590

Number of partitions of n in which the least part is odd. A26804

Monotonic ordering of set S generated by these rules: if·and y are in S then x² + y² is in S, and 1 is in S. A192476