Properties of the Number 18938

Eighteen Thousand Nine Hundred Thirty-Eight

Basics

Value: 18937 → 18938 → 18939

Parity: even

Prime: No

Previous Prime: 18919

Next Prime: 18947

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 × 17 × 557

Divisors: 1, 2, 17, 34, 557, 1114, 9469, 18938

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111111010

Octal: 44772

Duodecimal: AB62

Hexadecimal: 49fa

Square: 358647844

Square Root: 137.6154061142865

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 integer partitions of n whose length times maximum is a multiple of n. A326849

a(n) = 169·n² - 140·n + 29. A156639

Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222643

Numbers k such that the sums (with multiplicity) of prime factors of k and k+1 are both squares. A359445

Number of ordered 5-tuples of integers from [ 2,n ] with no common factors among quadruples. A15655

Floor((xⁿ - (1-x)ⁿ)/2 +.5) where x = (sqrt(4)+1)/2 = 3/2. A136423

T(n,k)=Number of nXk 0..2 arrays with no more than floor(nXk/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222649

Decimal expansion of e^π - π. A18938

Positions of records for ratio A003961(n)/σ(n), where A003961 is fully multiplicative with a(p) = nextprime(p) and σ is the sum of the divisors function. A378659