41638643 has 4 divisors (see below), whose sum is σ = 41683560. Its totient is φ = 41593728.

The previous prime is 41638631. The next prime is 41638679. The reversal of 41638643 is 34683614.

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 41638643 - 2²² = 37444339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (41638603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21038 + ... + 22931.

It is an arithmetic number, because the mean of its divisors is an integer number (10420890).

Almost surely, 2^41638643 is an apocalyptic number.

41638643 is a deficient number, since it is larger than the sum of its proper divisors (44917).

41638643 is an equidigital number, since it uses as much as digits as its factorization.

41638643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44916.

The product of its digits is 41472, while the sum is 35.

The square root of 41638643 is about 6452.8011746838. The cubic root of 41638643 is about 346.6028976434.

The spelling of 41638643 in words is "forty-one million, six hundred thirty-eight thousand, six hundred forty-three".