3686321 has 2 divisors, whose sum is σ = 3686322. Its totient is φ = 3686320.

The previous prime is 3686299. The next prime is 3686327. The reversal of 3686321 is 1236863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 1000000 = 1639^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 3686321 - 2¹⁴ = 3669937 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3686327) 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 as a sum of consecutive naturals, namely, 1843160 + 1843161.

It is an arithmetic number, because the mean of its divisors is an integer number (1843161).

Almost surely, 2^3686321 is an apocalyptic number.

It is an amenable number.

3686321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3686321 is an equidigital number, since it uses as much as digits as its factorization.

3686321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 3686321 is about 1919.9794269731. The cubic root of 3686321 is about 154.4771980328.

The spelling of 3686321 in words is "three million, six hundred eighty-six thousand, three hundred twenty-one".