3666409 has 2 divisors, whose sum is σ = 3666410. Its totient is φ = 3666408.

The previous prime is 3666371. The next prime is 3666413. The reversal of 3666409 is 9046663.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3240000 + 426409 = 1800^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 3666409 - 2⁷ = 3666281 is a prime.

It is not a weakly prime, because it can be changed into another prime (3666419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1833204 + 1833205.

It is an arithmetic number, because the mean of its divisors is an integer number (1833205).

Almost surely, 2^3666409 is an apocalyptic number.

It is an amenable number.

3666409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666409 is an equidigital number, since it uses as much as digits as its factorization.

3666409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 3666409 is about 1914.7869333166. The cubic root of 3666409 is about 154.1985548192.

The spelling of 3666409 in words is "three million, six hundred sixty-six thousand, four hundred nine".