Properties of the Number 18139

Eighteen Thousand One Hundred Thirty-Nine

Basics

Value: 18138 → 18139 → 18140

Parity: odd

Prime: No

Previous Prime: 18133

Next Prime: 18143

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 11 × 17 × 97

Divisors: 1, 11, 17, 97, 187, 1067, 1649, 18139

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011011011011

Octal: 43333

Duodecimal: A5B7

Hexadecimal: 46db

Square: 329023321

Square Root: 134.68110483657313

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 such that the number of odd parts is a part and the number of even parts is not a part. A240578

Integral quotients of products of consecutive composites divided by their sums: sums (divisors). A141091

G.f.: 1/(1 - x/(1 - x³/(1 - x⁶/(1 - x¹⁰/(1 - x¹⁵/(1 - x²¹/(1 -...- x^n*(n+1/2)/(1 -...))))))), a continued fraction. A206740

Products of three distinct strong primes. A363782

Numbers k such that h(k) = h(k-1) + h(k-2), where h(k) = A006577(k) + 1 is the length of the sequence {k, f(k), f(f(k)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.) A78418

Numbers n such that h(n) = 2 h(n-1) where h(n) is the length of the sequence {n, f(n), f(f(n)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.) A78419

Partial sums of A175317 (∑_d∣n pod(d)). A280114

Semiperimeter of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse. A89549

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 453", based on the 5-celled von Neumann neighborhood. A272275

Number of 10-digit positive integers in base n where the sum of the first k digits equals the sum of the last k digits. A240929