Properties of the Number 18865

Eighteen Thousand Eight Hundred Sixty-Five

Basics

Value: 18864 → 18865 → 18866

Parity: odd

Prime: No

Previous Prime: 18859

Next Prime: 18869

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 5 × 7 ³ × 11

Divisors: 1, 5, 7, 11, 35, 49, 55, 77, 245, 343

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100110110001

Octal: 44661

Duodecimal: AB01

Hexadecimal: 49b1

Square: 355888225

Square Root: 137.34991809244008

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

Prime factorization representation of Stern polynomials: a(0) = 1, a(1) = 2, a(2n) = A003961(a(n)), a(2n+1) = a(n)*a(n+1). A260443

Triangle read by rows: T(n, m) = number of forests with n nodes and m labeled trees. Also number of forests with exactly n - m edges on n labeled nodes. A105599

Triangle read by rows: T(n, k) is the number of forests on n labeled nodes with k edges. T(n, k) for n >= 1 and 0 <= k <= n-1. A138464

Number of forests with 2n nodes and n labeled trees. Also number of forests with exactly n edges on 2n labeled nodes. A302112

Number of main classes of extended self-orthogonal diagonal Latin squares of order n. A309210

Numbers that are the sum of four third powers in six or more ways. A345148

Numbers that are not a power of a prime but whose prime indices satisfy (mean) = (median) = (mode), assuming there is a unique mode. A363729

a(0)=1, a(1)=1, a(n)=7·a(n/2) for n=2,4,6,..., a(n)=6·a((n-1)/2)+a((n+1)/2) for n=3,5,7,.... A116522

Heinz numbers of integer partitions such that the difference between the length of the minimal square containing and the maximal square contained in the Young diagram is 1. A325179

Numbers that are the sum of four third powers in exactly six ways. A345149