3649605 has 16 divisors (see below), whose sum is σ = 5863104. Its totient is φ = 1938560.

The previous prime is 3649601. The next prime is 3649609. The reversal of 3649605 is 5069463.

It is a happy number.

3649605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3649601) and next prime (3649609).

It is not a de Polignac number, because 3649605 - 2² = 3649601 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

3649605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649601) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6745 + ... + 7265.

It is an arithmetic number, because the mean of its divisors is an integer number (366444).

Almost surely, 2^3649605 is an apocalyptic number.

It is an amenable number.

3649605 is a deficient number, since it is larger than the sum of its proper divisors (2213499).

3649605 is a wasteful number, since it uses less digits than its factorization.

3649605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 3649605 is about 1910.3939384326. The cubic root of 3649605 is about 153.9626181263.

Subtracting from 3649605 its product of nonzero digits (19440), we obtain a triangular number (3630165 = T₂₆₉₄).

The spelling of 3649605 in words is "three million, six hundred forty-nine thousand, six hundred five".