39664009 has 32 divisors (see below), whose sum is σ = 52966656. Its totient is φ = 28753920.

The previous prime is 39663997. The next prime is 39664019. The reversal of 39664009 is 90046693.

39664009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 39664009 - 2⁵ = 39663977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39664019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205417 + ... + 205609.

It is an arithmetic number, because the mean of its divisors is an integer number (1655208).

Almost surely, 2^39664009 is an apocalyptic number.

It is an amenable number.

39664009 is a deficient number, since it is larger than the sum of its proper divisors (13302647).

39664009 is a wasteful number, since it uses less digits than its factorization.

39664009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 39664009 is about 6297.9368844091. The cubic root of 39664009 is about 341.0349347742.

The spelling of 39664009 in words is "thirty-nine million, six hundred sixty-four thousand, nine".