Properties of the Number 342

Three Hundred Forty-Two

Basics

Value: 341 → 342 → 343

Parity: even

Prime: No

Previous Prime: 337

Next Prime: 347

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 19

Divisors: 1, 2, 3, 6, 9, 18, 19, 38, 57, 114

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

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Representations

Binary: 101010110

Octal: 526

Duodecimal: 246

Hexadecimal: 156

Square: 116964

Square Root: 18.49324200890693

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

Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1). A2378

Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n²/4). A2620

Heptagonal numbers (or 7-gonal numbers): n*(5·n-3)/2. A566

Numbers that are products of 4 primes. A14613

Nonnegative multiples of 6. A8588

Expansion of (1 - x)/((1 + x)*(1 - 2·x)). A78008

a(n) = n*φ(n). A2618

Sum of positive integers in smallest positive reduced residue system modulo n. a(1) = 1 by convention. A23896

Multiples of 9: a(n) = 9·n. A8591

Numbers that are the sum of 3 positive cubes. A3072