Properties of the Number 42180

Forty-Two Thousand One Hundred Eighty

Basics

Value: 42179 → 42180 → 42181

Parity: even

Prime: No

Previous Prime: 42179

Next Prime: 42181

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 5 × 19 × 37

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 19

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010010011000100

Octal: 122304

Duodecimal: 204B0

Hexadecimal: a4c4

Square: 1779152400

Square Root: 205.37770083434083

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 k such that sopfr(k) = sopfr(k - sopfr(k)). A50781

Row sums of triangle A134480. A134481

Antidiagonal sums of the convolution array A213849. A213850

Expansion of 1/(1 - ∑_k>=1 x^prime(k)/(1 - x^prime(k))). A300671

a(n) = A016755(n) - A001845(n). A188050

Number of n X 2 0..1 arrays with each 1 adjacent to 0, 1 or 3 king-move neighboring 1s. A296645

Midpoints k of a pair of twin primes such that σ(k) is also the midpoint of a pair of twin primes. A349981

a(n) = n*(2·n+1)*binomial(n+2,n)/3. A289643

Numerators of continued fraction convergents to sqrt(615). A42180