Properties of the Number 19694

Nineteen Thousand Six Hundred Ninety-Four

Basics

Value: 19693 → 19694 → 19695

Parity: even

Prime: No

Previous Prime: 19687

Next Prime: 19697

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 × 43 × 229

Divisors: 1, 2, 43, 86, 229, 458, 9847, 19694

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110011101110

Octal: 46356

Duodecimal: B492

Hexadecimal: 4cee

Square: 387853636

Square Root: 140.33531273346705

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

Sum of 12 positive 9th powers. A4801

Number of series-reduced rooted trees whose leaves are sets (not necessarily disjoint) with multiset union a strongly normal multiset of size n. A330625

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A237936

Numbers k such that 6·p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)-1 and 6·p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)+1 are twin primes with p(h) = h-th prime. A129310

a(n) is the start of the least run of exactly n consecutive positive integers with the same value of A071626, or -1 if no such run exists. A357386

Number of (n+1)X(2+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A237932

a(n) = a(n-1) + 2·a(n-2) + 8·Fibonacci(n) + 2·Fibonacci(n-1); a(1) = 4, a(2) = 14. A291675

Number of nX7 0..1 arrays with every element equal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero. A297985

Length of iteration sequence of shortest unimodal Collatz (3x+1)/2 sequence that begins with exactly n increases and ends with continuous decreases until reaching 1. A381705

Decimal expansion of 2*π/5. A19694