39648209 has 2 divisors, whose sum is σ = 39648210. Its totient is φ = 39648208.

The previous prime is 39648181. The next prime is 39648239. The reversal of 39648209 is 90284693.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32809984 + 6838225 = 5728^2 + 2615^2 .

It is an emirp because it is prime and its reverse (90284693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39648209 - 2²⁰ = 38599633 is a prime.

It is not a weakly prime, because it can be changed into another prime (39648239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19824104 + 19824105.

It is an arithmetic number, because the mean of its divisors is an integer number (19824105).

Almost surely, 2^39648209 is an apocalyptic number.

It is an amenable number.

39648209 is a deficient number, since it is larger than the sum of its proper divisors (1).

39648209 is an equidigital number, since it uses as much as digits as its factorization.

39648209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 39648209 is about 6296.6823804286. The cubic root of 39648209 is about 340.9896454575.

The spelling of 39648209 in words is "thirty-nine million, six hundred forty-eight thousand, two hundred nine".