Properties of the Number 42871

Forty-Two Thousand Eight Hundred Seventy-One

Basics

Value: 42870 → 42871 → 42872

Parity: odd

Prime: No

Previous Prime: 42863

Next Prime: 42899

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 43 × 997

Divisors: 1, 43, 997, 42871

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010011101110111

Octal: 123567

Duodecimal: 20987

Hexadecimal: a777

Square: 1837922641

Square Root: 207.05313327742712

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

Consider all ways of writing a number as p+2m² where p is 1 or a prime and m >= 0; sequence gives numbers that are expressible in at least 2 more ways than any smaller number. A16067

Absolute discriminants of imaginary quadratic number fields with elementary bicyclic 5-class group (5,5). A359871

n³*a(n) is the number of circles in complex projective plane tangent to three smooth curves of degree n in general position. A30653

Denominators of continued fraction convergents to sqrt(967). A42871

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7. A251916