3643565 has 4 divisors (see below), whose sum is σ = 4372284. Its totient is φ = 2914848.

The previous prime is 3643561. The next prime is 3643579. The reversal of 3643565 is 5653463.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2725801 + 917764 = 1651^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 3643565 - 2² = 3643561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643561) 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 3 ways as a sum of consecutive naturals, for example, 364352 + ... + 364361.

It is an arithmetic number, because the mean of its divisors is an integer number (1093071).

Almost surely, 2^3643565 is an apocalyptic number.

It is an amenable number.

3643565 is a deficient number, since it is larger than the sum of its proper divisors (728719).

3643565 is an equidigital number, since it uses as much as digits as its factorization.

3643565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728718.

The product of its digits is 32400, while the sum is 32.

The square root of 3643565 is about 1908.8124580482. The cubic root of 3643565 is about 153.8776365378.

The spelling of 3643565 in words is "three million, six hundred forty-three thousand, five hundred sixty-five".