80009 has 4 divisors (see below), whose sum is σ = 84240. Its totient is φ = 75780.

The previous prime is 79999. The next prime is 80021. The reversal of 80009 is 90008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80009 - 2¹² = 75913 is a prime.

It is a magnanimous number.

It is an Ulam number.

It is a Duffinian number.

80009 is a modest number, since divided by 9 gives 8 as remainder.

It is a Curzon number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (80039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (21060).

2⁸⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

80009 is a deficient number, since it is larger than the sum of its proper divisors (4231).

80009 is a wasteful number, since it uses less digits than its factorization.

80009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 80009 is about 282.8586219298. The cubic root of 80009 is about 43.0903095661.

Subtracting 80009 from its reverse (90008), we obtain a palindrome (9999).

The spelling of 80009 in words is "eighty thousand, nine".