Properties of the Number 18886

Eighteen Thousand Eight Hundred Eighty-Six

Basics

Value: 18885 → 18886 → 18887

Parity: even

Prime: No

Previous Prime: 18869

Next Prime: 18899

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 × 7 × 19 × 71

Divisors: 1, 2, 7, 14, 19, 38, 71, 133, 142, 266

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100111000110

Octal: 44706

Duodecimal: AB1A

Hexadecimal: 49c6

Square: 356680996

Square Root: 137.42634390829147

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

Number of partitions of n having positive odd rank (the rank of a partition is the largest part minus the number of parts). A101707

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays x(i,j) with row sums sum{x(i,j), j=1..k+1} nondecreasing, and column sums sum{i·x(i,j), i=1..n+1} nondecreasing. A232886

Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of 1/sqrt(1 - 4·k*x - 4·x²). A386621

a(n) = ∑_k=0..n (n-i)^k * (n+i)^n-k * binomial(n,k)², where i is the imaginary unit. A387430

Number of days after Mar 01 00 such that the date written in the format DD.MM.YY is palindromic. A210887

a(n) = (11·n+1)*(11·n+10). A1536

Products of four distinct primes between sphenic numbers (products of 3 distinct primes). A351382

a(n) = ∏_k=0..n-1 (1 + binomial(n,k)*a(k)), with a(0) = 1. A129785

Number of (n+1)X(1+1) 0..3 arrays x(i,j) with row sums sum{x(i,j), j=1..1+1} nondecreasing, and column sums sum{i·x(i,j), i=1..n+1} nondecreasing. A232884

Number of length 3 0..n arrays with each partial sum starting from the beginning no more than sqrt(3) standard deviations from its mean. A244942