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Properties of the Number 18838

Eighteen Thousand Eight Hundred Thirty-Eight

Basics

Value: 18837 → 18838 → 18839

Parity: even

Prime: No

Previous Prime: 18803

Next Prime: 18839

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 2 × 9419

Divisors: 1, 2, 9419, 18838

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100100110010110

Octal: 44626

Duodecimal: AA9A

Hexadecimal: 4996

Square: 354870244

Square Root: 137.2515937976678

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

Denominators of an Egyptian fraction for 1/ζ(2) = 0.607927101854... (A059956). A144835
Base-2 expansion of a(n) encodes the steps where numbers of the form 4k+1 are encountered when map x -> A252463(x) is iterated down to 1, starting from x=n. A292381
T(n,k)=Number of -k..k arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing. A200192
Number of partitions of n where the minimal multiplicity of any part is 2. A244515
Semiprimes in A054552. A113690
Expansion of e.g.f. ∏k>=1 (1 + xprime(k))1/prime(k!). A352005
Semiprimes that are also the sums of two, three and four successive semiprimes. A370685
Semiprimes that are the sum of 10 consecutive primes. A185347
Number of -6..6 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing. A200190
Number of -n..n arrays x(0..5) of 6 elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing. A200195