Properties of the Number 42195

Forty-Two Thousand One Hundred Ninety-Five

Basics

Value: 42194 → 42195 → 42196

Parity: odd

Prime: No

Previous Prime: 42193

Next Prime: 42197

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 29 × 97

Divisors: 1, 3, 5, 15, 29, 87, 97, 145, 291, 435

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1010010011010011

Octal: 122323

Duodecimal: 20503

Hexadecimal: a4d3

Square: 1780418025

Square Root: 205.4142156716521

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

Triangular numbers which have one or more occurrences of exactly five different digits. A241788

Least triangular number t such that t = prime(n)*triangular(m) for some m>0, or 0 if no such t exists. A225503

Triangular numbers t which are average of two consecutive primes p and p+4. A129752

Triangular numbers with sum of digits = 21. A68131

Triangular numbers that are hypotenuse and a leg of a Pythagorean triple. A213188

Expansion of ∏_k>0 (1 - x^k)^k·3. A276552

a(n) = 49*(n*(n+1)/2) + 6. A61792

Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically. A208103

Triangular numbers equal to the sum of a prime number with its index. A115886

Triangular numbers for which the sum of the digits is an octagonal number. A117523