Properties of the Number 18540

Eighteen Thousand Five Hundred Forty

Basics

Value: 18539 → 18540 → 18541

Parity: even

Prime: No

Previous Prime: 18539

Next Prime: 18541

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 5 × 103

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100001101100

Octal: 44154

Duodecimal: A890

Hexadecimal: 486c

Square: 343731600

Square Root: 136.1616686149226

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

T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 1,0 1,1 0,-1 or -1,1. A264569

Numbers k such that k-1, k+1 and k²+1 are prime numbers. A70155

Sum of all the parts in the partitions of n into 7 parts. A308926

a(1)=1, a(2)=2; for n >= 2, a(n+1) = a(n) + sum of prime factors of a(n). A96461

Number of compositions of n with distinct differences up to sign. A325552

Numbers m such that m⁴-1 has no divisors d with 1 < d < m-1. A129293

Row sums of triangle A131321. A131322

Averages of twin primes such that the sum of the lower, average and upper parts of the twin primes are averages of other twin primes. A132929

Numbers k such that k*((2⁶¹-1)²) - 1 and k*((2⁶¹-1)²) + 1 are twin primes. A99229

a(n) = ∑_k=0..n binomial(n+k,2k)*Fibonacci(2k+1). A166482