3636643 has 4 divisors (see below), whose sum is σ = 3661200. Its totient is φ = 3612088.

The previous prime is 3636631. The next prime is 3636667. The reversal of 3636643 is 3466363.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3636643 - 2¹⁷ = 3505571 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3636683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12055 + ... + 12352.

It is an arithmetic number, because the mean of its divisors is an integer number (915300).

Almost surely, 2^3636643 is an apocalyptic number.

3636643 is a deficient number, since it is larger than the sum of its proper divisors (24557).

3636643 is a wasteful number, since it uses less digits than its factorization.

3636643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24556.

The product of its digits is 23328, while the sum is 31.

The square root of 3636643 is about 1906.9984268478. The cubic root of 3636643 is about 153.7801298169.

The spelling of 3636643 in words is "three million, six hundred thirty-six thousand, six hundred forty-three".