Properties of the Number 19942

Nineteen Thousand Nine Hundred Forty-Two

Basics

Value: 19941 → 19942 → 19943

Parity: even

Prime: No

Previous Prime: 19937

Next Prime: 19949

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 13 ² × 59

Divisors: 1, 2, 13, 26, 59, 118, 169, 338, 767, 1534

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110111100110

Octal: 46746

Duodecimal: B65A

Hexadecimal: 4de6

Square: 397683364

Square Root: 141.2161463856028

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

Numbers that are the sum of 7 nonzero 8th powers. A3385

Central element of a series of 5 successive nonsquarefree numbers. A188296

Triangle read by rows in which the n-th row gives the smallest set of n consecutive numbers with the same prime signatures. A83785

Sequence S with property (making all terms distinct) that (i) a(1)=3, (ii) for n in S, a(n)=a(1)+a(2)+...+a(n-1), (iii) for n not in S, a(n)=the smallest number different from a(1), ..., a(n-1) not breaking condition (ii). A121174

Nonsquarefree numbers k such that A003415(k) divides A276086(k), where A003415 is the arithmetic derivative, and A276086 is the primorial base exp-function. A371085

a(0) = 1; a(n) = ∑_k=1..n (2^k-1) * a(k-1) * a(n-k). A376111

Composite numbers k such that φ(k + d(k)) = φ(k) + d(k), where φ() = A000010(), d() = A000005(). A63702

a(n) = 2·n + 7ⁿ + 5ⁿ. A121200

Expansion of g/(1 - x·g)³, where g = 1+x·g⁴ is the g.f. of A002293. A391274

a(n) is the least k such that, if x₀, x₁, x₂, ... are the iterations of the arithmetic derivative A003415 starting with x₀ = k, x₀ > x₁ > ... > x_n. A363373