3640305 has 32 divisors (see below), whose sum is σ = 6272640. Its totient is φ = 1797120.

The previous prime is 3640289. The next prime is 3640309. The reversal of 3640305 is 5030463.

It is not a de Polignac number, because 3640305 - 2⁴ = 3640289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3640309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14985 + ... + 15225.

It is an arithmetic number, because the mean of its divisors is an integer number (196020).

Almost surely, 2^3640305 is an apocalyptic number.

It is an amenable number.

3640305 is a deficient number, since it is larger than the sum of its proper divisors (2632335).

3640305 is a wasteful number, since it uses less digits than its factorization.

3640305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 3640305 is about 1907.9583328784. The cubic root of 3640305 is about 153.8317299618.

Adding to 3640305 its reverse (5030463), we get a palindrome (8670768).

The spelling of 3640305 in words is "three million, six hundred forty thousand, three hundred five".