39009 has 4 divisors (see below), whose sum is σ = 52016. Its totient is φ = 26004.

The previous prime is 38993. The next prime is 39019. The reversal of 39009 is 90093.

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 not a de Polignac number, because 39009 - 2⁴ = 38993 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (39019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6499 + ... + 6504.

It is an arithmetic number, because the mean of its divisors is an integer number (13004).

2³⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

39009 is a deficient number, since it is larger than the sum of its proper divisors (13007).

39009 is a wasteful number, since it uses less digits than its factorization.

39009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13006.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 39009 is about 197.5069619026. The cubic root of 39009 is about 33.9147228537.

The spelling of 39009 in words is "thirty-nine thousand, nine".