3687209 has 2 divisors, whose sum is σ = 3687210. Its totient is φ = 3687208.

The previous prime is 3687169. The next prime is 3687227. The reversal of 3687209 is 9027863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2371600 + 1315609 = 1540^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 3687209 - 2⁸ = 3686953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3687239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1843604 + 1843605.

It is an arithmetic number, because the mean of its divisors is an integer number (1843605).

Almost surely, 2^3687209 is an apocalyptic number.

It is an amenable number.

3687209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3687209 is an equidigital number, since it uses as much as digits as its factorization.

3687209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 3687209 is about 1920.2106655261. The cubic root of 3687209 is about 154.4896010708.

The spelling of 3687209 in words is "three million, six hundred eighty-seven thousand, two hundred nine".