Properties of the Number 408

Four Hundred Eight

Basics

Value: 407 → 408 → 409

Parity: even

Prime: No

Previous Prime: 401

Next Prime: 409

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 17

Divisors: 1, 2, 3, 4, 6, 8, 12, 17, 24, 34

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110011000

Octal: 630

Duodecimal: 2A0

Hexadecimal: 198

Square: 166464

Square Root: 20.199009876724155

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

Pell numbers: a(0) = 0, a(1) = 1; for n > 1, a(n) = 2·a(n-1) + a(n-2). A129

Octagonal numbers: n*(3·n-2). Also called star numbers. A567

Triangular matchstick numbers: a(n) = 3·n*(n+1)/2. A45943

Generalized octagonal numbers: k*(3·k-2), k=0, +- 1, +- 2, +-3, ... A1082

Numbers that are products of 5 primes (or 5-almost primes, a generalization of semiprimes). A14614

Numbers that are the sum of 3 positive cubes. A3072

Expansion of g.f. x/((1 - x)²*(1 - x³)). A1840

a(n) = floor(n²/3). A212

a(n) = 6·a(n-1) - a(n-2) for n > 1, a(0)=0 and a(1)=2. A1542

Numbers that contain even digits only. A14263