3653643 has 16 divisors (see below), whose sum is σ = 5861120. Its totient is φ = 1977696.

The previous prime is 3653603. The next prime is 3653647. The reversal of 3653643 is 3463563.

It is not a de Polignac number, because 3653643 - 2⁶ = 3653579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3653643.

It is not an unprimeable number, because it can be changed into a prime (3653647) 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, 4180 + ... + 4977.

It is an arithmetic number, because the mean of its divisors is an integer number (366320).

Almost surely, 2^3653643 is an apocalyptic number.

3653643 is a deficient number, since it is larger than the sum of its proper divisors (2207477).

3653643 is a wasteful number, since it uses less digits than its factorization.

3653643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186.

The product of its digits is 19440, while the sum is 30.

The square root of 3653643 is about 1911.4504963509. The cubic root of 3653643 is about 154.0193796941.

The spelling of 3653643 in words is "three million, six hundred fifty-three thousand, six hundred forty-three".