Properties of the Number 42019

Forty-Two Thousand Nineteen

Basics

Value: 42018 → 42019 → 42020

Parity: odd

Prime: Yes

Previous Prime: 42017

Next Prime: 42023

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 42019

Divisors: 1, 42019

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 1010010000100011

Octal: 122043

Duodecimal: 20397

Hexadecimal: a423

Square: 1765596361

Square Root: 204.98536533128407

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

Primes of the form n² - 6. A28880

Row sums of the inverse of number triangle A(n,k) = 1/C(n) if k <= n <= 2k, 0 otherwise, where C(n) = A000108(n). A127768

a(n) = A127768(2n+1). A bisection of the row sums of the inverse of number triangle A(n,k) = 1/C(n) if k <= n <= 2k, 0 otherwise, where C(n) = A000108(n). A127770

Primes of form p·q + 30, where p and q are consecutive primes. A229570

Slowest increasing sequence of primes such that a(n - 1) + a(n) and a(n - 1)² + a(n)² are both semiprimes, with a(1)=2. A365050

a(n) is the smallest prime p such that p - a(n-1) is a primorial, starting with a(1)=2. A380026

Depression-type primes with five digits; from left to right digits decrease to and increase from the central digit. A157083

Denominators of continued fraction convergents to sqrt(533). A42019

Number of (n+1)X6 0..1 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards. A204036