Properties of the Number 40009

Forty Thousand Nine

Basics

Value: 40008 → 40009 → 40010

Parity: odd

Prime: Yes

Previous Prime: 39989

Next Prime: 40013

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 40009

Divisors: 1, 40009

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1001110001001001

Octal: 116111

Duodecimal: 1B1A1

Hexadecimal: 9c49

Square: 1600720081

Square Root: 200.02249873451737

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 having only {0, 4, 9} as digits. A385768

Naughty primes: primes in which the number of zeros is greater than the number of all other digits. A164968

Primes having only 0,4,6,8,9 as digits. A61372

Prime numbers such that, in base 10, all their proper prefixes and suffixes represent composites. A254754

Smallest prime in which the n-th significant digit is a 4. A69594

Primes of the form k² + 9. A138353

Happy primes of the form a·10^k + b with single-digit a and b, a > 0, k > 0. A109902

Prime numbers obtained by inserting a 0 between each pair of adjacent digits of a prime number > 10. A119680

Q-residue of the Lucas triangle A114525, where Q is the triangle given by t(i,j)=1 for 0<=i<=j. (See Comments.) A193662

Primes having only {0, 4, 7, 9} as digits. A386075