Properties of the Number 816

Eight Hundred Sixteen

Basics

Value: 815 → 816 → 817

Parity: even

Prime: No

Previous Prime: 811

Next Prime: 821

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ⁴ × 3 × 17

Divisors: 1, 2, 3, 4, 6, 8, 12, 16, 17, 24

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

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Representations

Binary: 1100110000

Octal: 1460

Duodecimal: 580

Hexadecimal: 330

Square: 665856

Square Root: 28.5657137141714

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

Tetrahedral (or triangular pyramidal) numbers: a(n) = C(n+2,3) = n*(n+1)*(n+2)/6. A292

Padovan sequence (or Padovan numbers): a(n) = a(n-2) + a(n-3) with a(0) = 1, a(1) = a(2) = 0. A931

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

Number of standard puzzles of shape 2 X n with support CK (see reference for precise definition). A196265

Numbers that are divisible by the product of their digits. A7602

Numbers m such that ∑_k=1..m (<1/2 + k·r> - <k·r>) = 0, where r=sqrt(2) and < > denotes fractional part. A194368

Numbers that are divisible by exactly 6 primes with multiplicity. A46306

List of codewords in binary lexicode with Hamming distance 4 written as decimal numbers. A75928

Number of partitions of n into at most 4 parts. A1400

Double-bitters: only even length runs in binary expansion. A1196