Properties of the Number 40022

Forty Thousand Twenty-Two

Basics

Value: 40021 → 40022 → 40023

Parity: even

Prime: No

Previous Prime: 40013

Next Prime: 40031

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 × 20011

Divisors: 1, 2, 20011, 40022

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1001110001010110

Octal: 116126

Duodecimal: 1B1B2

Hexadecimal: 9c56

Square: 1601760484

Square Root: 200.05499243957897

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

Hypercomma numbers: n occurs in the sequence S[k+1]=S[k]+10·last_digit(S[k-1])+first_digit(S[k]) for each "legal" splitting n=concat(S[0],S[1]). A166508

Numbers n such that z(n) and z(n+1) are both prime, where z(n) = a^d + b^d + c^d + ..., where a·b*c* ... is the prime factorization of n and d is the largest digit of n. A109280

a(n) = a(n-1) - 4·a(n-2), a(0)=1, a(1)=2. A133631

Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-4)/2. A48063

Continued fraction for sqrt(28). A40022

Number of nX3 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal. A206895

Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically. A207708