3645665 has 8 divisors (see below), whose sum is σ = 4446888. Its totient is φ = 2868480.

The previous prime is 3645659. The next prime is 3645683. The reversal of 3645665 is 5665463.

3645665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 234256 + 3411409 = 484^2 + 1847^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3645665 - 2⁸ = 3645409 is a prime.

It is a d-powerful number, because it can be written as 3⁵ + 6⁷ + 4 + 5⁵ + 6⁸ + 6⁸ + 5⁵ .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5672 + ... + 6281.

It is an arithmetic number, because the mean of its divisors is an integer number (555861).

Almost surely, 2^3645665 is an apocalyptic number.

It is an amenable number.

3645665 is a deficient number, since it is larger than the sum of its proper divisors (801223).

3645665 is a wasteful number, since it uses less digits than its factorization.

3645665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12019.

The product of its digits is 64800, while the sum is 35.

The square root of 3645665 is about 1909.3624590423. The cubic root of 3645665 is about 153.9071937594.

The spelling of 3645665 in words is "three million, six hundred forty-five thousand, six hundred sixty-five".