Properties of the Number 18042

Eighteen Thousand Forty-Two

Basics

Value: 18041 → 18042 → 18043

Parity: even

Prime: No

Previous Prime: 18041

Next Prime: 18043

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 31 × 97

Divisors: 1, 2, 3, 6, 31, 62, 93, 97, 186, 194

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011001111010

Octal: 43172

Duodecimal: A536

Hexadecimal: 467a

Square: 325513764

Square Root: 134.320512208672

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, not necessarily connected, regular simple graphs on n vertices with girth at least 4. A185314

Numbers on the square spiral board that are enclosed by four primes. A341542

Number of rooted trees with n nodes with every leaf at height 9. A48814

Smallest sets of 7 consecutive abundant numbers in arithmetic progression. The initial abundant number is listed. A228964

Number of partitions p of n that do not include (min(p) + max(p))/2 as a part. A238481

Twin primes x, represented by their average, such that·is the first and x+18 the last of three successive twins. A350541

Sequence of the "Natural Jewels": a natural jewel is a number that is totally enclosed by prime numbers in a version of Ulam Spiral. A172294

Squarefree numbers n such that n² + 1 and n² - 1 are semiprime. A268697

a(1) = 102735, a(n) = prime(n-1)*a(n-1) but products that are not in A010784 are first reduced as in A320486 (see comments); continue until zero is reached. A321149

Averages k of twin primes such that the sum (with multiplicity) of prime factors of k-1, k and k+1 is prime. A340060