Properties of the Number 18765

Eighteen Thousand Seven Hundred Sixty-Five

Basics

Value: 18764 → 18765 → 18766

Parity: odd

Prime: No

Previous Prime: 18757

Next Prime: 18773

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 5 × 139

Divisors: 1, 3, 5, 9, 15, 27, 45, 135, 139, 417

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100101001101

Octal: 44515

Duodecimal: AA39

Hexadecimal: 494d

Square: 352125225

Square Root: 136.98540068197048

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

First trisection of A061037 (Balmer line series of the hydrogen atom). A142590

a(n) = prime(n)²-4. A166010

a(n) = (4·n+3)*(4·n+7). A85027

Quintisection A061037(5·n+2). A165248

Starts of runs of 3 consecutive integers that are Stolarsky-Niven numbers (A364123). A364125

Numbers k such that 24·k-1 has at least three factors 7 and the partition function evaluated at k has at least the same number of factors 7 as 24·k-1. A340957

Deficient numbers n having a companion m > n such that σ(n)/n = σ(m)/m. A212608

Number of nondecreasing sequences of 4 1..n integers with no element dividing the sequence sum. A212871

E.g.f. ∑_n>=0 Series_Reversion( x·exp(-n·x) )ⁿ. A299426

G.f. A(x) satisfies A(x) = 1 + x·A(x)*A(x²)². A217925