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Properties of the Number 3818

Three Thousand Eight Hundred Eighteen

Basics

Value: 3817 → 3818 → 3819

Parity: even

Prime: No

Previous Prime: 3803

Next Prime: 3821

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 23 × 83

Divisors: 1, 2, 23, 46, 83, 166, 1909, 3818

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 111011101010

Octal: 7352

Duodecimal: 2262

Hexadecimal: eea

Square: 14577124

Square Root: 61.78996682310163

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

Generalized 17-gonal (or heptadecagonal) numbers: m*(15·m - 13)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303305
Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m·k + 1)*T(n-1, k, m) + m·f(n,k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1, f(n, k) = k if k <= floor(n/2) otherwise n-k, and m = 1, read by rows. A157207
17-gonal (or heptadecagonal) numbers: a(n) = n*(15·n-13)/2. A51869
Number of cyclic arrangements (up to direction) of {1,2,...,n} such that the difference between any two neighbors is bk for some b>1 and k>1. A242521
Unitary untouchable numbers: us(x) = n has no solution where us(x) (A063919) is the sum of the proper unitary divisors of x. A63948
a(n) = n*(2·n2 -3·n +7)/6 = C(n, 1) + C(n, 2) + 2·C(n, 3). A81489
T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302265
a(n) = a(n-1) + a(m) for n >= 4, where m = 2·n - 3 - 2p+1 and p is the smallest integer such that 2p < n - 1 <= 2p+1, starting with a(1) = a(2) = a(3) = 1. A50024
a(n) = a(n-1) + a(m) for n >= 4, where m = 2·n - 3 - 2p+1 and p is the unique integer such that 2p < n - 1 <= 2p+1, starting with a(1) = 1, a(2) = 2, and a(3) = 1. A50040
a(n) = a(n-1) + a(m) for n >= 4, where m = 2·n - 3 - 2p+1 and p is the unique integer such that 2p < n - 1 <= 2p+1, starting with a(1) = 1, a(2) = 3, and a(3) = 1. A50056