3866609 has 2 divisors, whose sum is σ = 3866610. Its totient is φ = 3866608.

The previous prime is 3866581. The next prime is 3866617. The reversal of 3866609 is 9066683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2958400 + 908209 = 1720^2 + 953^2 .

It is an emirp because it is prime and its reverse (9066683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3866609 - 2¹⁶ = 3801073 is a prime.

It is not a weakly prime, because it can be changed into another prime (3866809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933304 + 1933305.

It is an arithmetic number, because the mean of its divisors is an integer number (1933305).

Almost surely, 2^3866609 is an apocalyptic number.

It is an amenable number.

3866609 is a deficient number, since it is larger than the sum of its proper divisors (1).

3866609 is an equidigital number, since it uses as much as digits as its factorization.

3866609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 3866609 is about 1966.3694973224. The cubic root of 3866609 is about 156.9555772462.

The spelling of 3866609 in words is "three million, eight hundred sixty-six thousand, six hundred nine".