3645205 has 4 divisors (see below), whose sum is σ = 4374252. Its totient is φ = 2916160.

The previous prime is 3645193. The next prime is 3645227. The reversal of 3645205 is 5025463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5025463 = 1759 ⋅2857.

It can be written as a sum of positive squares in 2 ways, for example, as 799236 + 2845969 = 894^2 + 1687^2 .

It is not a de Polignac number, because 3645205 - 2⁷ = 3645077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3645205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364516 + ... + 364525.

It is an arithmetic number, because the mean of its divisors is an integer number (1093563).

Almost surely, 2^3645205 is an apocalyptic number.

It is an amenable number.

3645205 is a deficient number, since it is larger than the sum of its proper divisors (729047).

3645205 is an equidigital number, since it uses as much as digits as its factorization.

3645205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729046.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 3645205 is about 1909.2419961859. The cubic root of 3645205 is about 153.9007202914.

The spelling of 3645205 in words is "three million, six hundred forty-five thousand, two hundred five".