Properties of the Number 19679

Nineteen Thousand Six Hundred Seventy-Nine

Basics

Value: 19678 → 19679 → 19680

Parity: odd

Prime: No

Previous Prime: 19661

Next Prime: 19681

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 11 × 1789

Divisors: 1, 11, 1789, 19679

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110011011111

Octal: 46337

Duodecimal: B47B

Hexadecimal: 4cdf

Square: 387263041

Square Root: 140.28185912654564

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

Absolute discriminants of complex quadratic fields with 3-class rank 2. A242862

a(0)=a(1)=1; for n>1, a(n) = 2·a(n-1) + 1 if a(n-1) and n are coprime, otherwise a(n) = a(n-1)/gcd(a(n-1),n). A133580

Semiprime nearest to 3ⁿ. In case of a tie, choose the smaller. A117416

a(n) = 3ⁿ - 4. A168611

Monotonic ordering of nonnegative differences 3ⁱ-4^j, for 40>= i>=0, j>=0. A192147

a(n) = numerator(∑_k=1..n d(k+1)/d(k)), where d is the number of divisors function. A386925

n³*a(n) is the number of circles in complex projective plane tangent to three smooth curves of degree n in general position. A30653

Numbers k such that 4·10^k - 9 is prime. A101396

Value of concatenation of all suffixes of binary representation of n. A241426

a(n) = (n+1)⁽ⁿ⁺¹ⁿ) - n^{n^(n-1}). A112406