3656609 has 16 divisors (see below), whose sum is σ = 4233600. Its totient is φ = 3125760.

The previous prime is 3656593. The next prime is 3656617. The reversal of 3656609 is 9066563.

It is not a de Polignac number, because 3656609 - 2⁴ = 3656593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656669) 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 in 15 ways as a sum of consecutive naturals, for example, 24467 + ... + 24615.

It is an arithmetic number, because the mean of its divisors is an integer number (264600).

Almost surely, 2^3656609 is an apocalyptic number.

It is an amenable number.

3656609 is a deficient number, since it is larger than the sum of its proper divisors (576991).

3656609 is a wasteful number, since it uses less digits than its factorization.

3656609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 3656609 is about 1912.2261895498. The cubic root of 3656609 is about 154.0610456808.

The spelling of 3656609 in words is "three million, six hundred fifty-six thousand, six hundred nine".