3640205 has 8 divisors (see below), whose sum is σ = 4380000. Its totient is φ = 2904336.

The previous prime is 3640181. The next prime is 3640207. The reversal of 3640205 is 5020463.

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

It is a cyclic number.

It is not a de Polignac number, because 3640205 - 2¹⁴ = 3623821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640207) 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 7 ways as a sum of consecutive naturals, for example, 1766 + ... + 3224.

It is an arithmetic number, because the mean of its divisors is an integer number (547500).

Almost surely, 2^3640205 is an apocalyptic number.

It is an amenable number.

3640205 is a deficient number, since it is larger than the sum of its proper divisors (739795).

3640205 is a wasteful number, since it uses less digits than its factorization.

3640205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 3640205 is about 1907.9321266754. The cubic root of 3640205 is about 153.8303213515.

Adding to 3640205 its reverse (5020463), we get a palindrome (8660668).

The spelling of 3640205 in words is "three million, six hundred forty thousand, two hundred five".