3689209 has 2 divisors, whose sum is σ = 3689210. Its totient is φ = 3689208.

The previous prime is 3689207. The next prime is 3689237. The reversal of 3689209 is 9029863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3686400 + 2809 = 1920^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 3689209 - 2¹ = 3689207 is a prime.

It is a super-3 number, since 3×3689209³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 3689207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3689207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1844604 + 1844605.

It is an arithmetic number, because the mean of its divisors is an integer number (1844605).

Almost surely, 2^3689209 is an apocalyptic number.

It is an amenable number.

3689209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3689209 is an equidigital number, since it uses as much as digits as its factorization.

3689209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 3689209 is about 1920.7313711188. The cubic root of 3689209 is about 154.5175285496.

The spelling of 3689209 in words is "three million, six hundred eighty-nine thousand, two hundred nine".