18638241 has 4 divisors (see below), whose sum is σ = 24850992. Its totient is φ = 12425492.

The previous prime is 18638227. The next prime is 18638251. The reversal of 18638241 is 14283681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18638241 - 2⁵ = 18638209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18638201) 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 3 ways as a sum of consecutive naturals, for example, 3106371 + ... + 3106376.

It is an arithmetic number, because the mean of its divisors is an integer number (6212748).

Almost surely, 2^18638241 is an apocalyptic number.

It is an amenable number.

18638241 is a deficient number, since it is larger than the sum of its proper divisors (6212751).

18638241 is an equidigital number, since it uses as much as digits as its factorization.

18638241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6212750.

The product of its digits is 9216, while the sum is 33.

The square root of 18638241 is about 4317.2029139247. The cubic root of 18638241 is about 265.1357605075.

The spelling of 18638241 in words is "eighteen million, six hundred thirty-eight thousand, two hundred forty-one".