3643649 has 16 divisors (see below), whose sum is σ = 4049280. Its totient is φ = 3265920.

The previous prime is 3643639. The next prime is 3643657. The reversal of 3643649 is 9463463.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3643649 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49877 + ... + 49949.

It is an arithmetic number, because the mean of its divisors is an integer number (253080).

Almost surely, 2^3643649 is an apocalyptic number.

It is an amenable number.

3643649 is a deficient number, since it is larger than the sum of its proper divisors (405631).

3643649 is a wasteful number, since it uses less digits than its factorization.

3643649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200.

The product of its digits is 46656, while the sum is 35.

The square root of 3643649 is about 1908.8344611307. The cubic root of 3643649 is about 153.8788190447.

The spelling of 3643649 in words is "three million, six hundred forty-three thousand, six hundred forty-nine".