Properties of the Number 19879

Nineteen Thousand Eight Hundred Seventy-Nine

Basics

Value: 19878 → 19879 → 19880

Parity: odd

Prime: No

Previous Prime: 19867

Next Prime: 19889

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 103 × 193

Divisors: 1, 103, 193, 19879

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110110100111

Octal: 46647

Duodecimal: B607

Hexadecimal: 4da7

Square: 395174641

Square Root: 140.99290762304324

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

a(n) is the total sum of the digits of n-digit primes. A130817

Denominators of continued fraction convergents to sqrt(560). A42073

Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of a. A96031

Odd composite numbers n, such that n, n+d, n·d and n/d are all odious (A000069) for every divisor d of n. A231558

Expansion of F(x², x) where F(x,y) is the g.f. of A239927. A239928

Composites c for which an integer 1 < k < c exists such that (c-k)! == -1 (mod c). A256519

Numbers k such that the factor method (A064097) for computing the k-th power has fewer multiplications than Knuth's power tree method (A114622). A256653

Numbers k such that k, k+1, k+2 and k+3 are all sums of a positive square and a positive cube. A329807

Expansion of ∑_k>=0 (k^k * x)^k/(1 - k^k * x)^k+1. A355466

Expansion of ∑_k>=0 (k³ * x)^k/(1 - x)^k+1. A355493