18838505 has 16 divisors (see below), whose sum is σ = 25906944. Its totient is φ = 12882240.

The previous prime is 18838451. The next prime is 18838529. The reversal of 18838505 is 50583881.

It is not a de Polignac number, because 18838505 - 2⁸ = 18838249 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21659 + ... + 22511.

It is an arithmetic number, because the mean of its divisors is an integer number (1619184).

Almost surely, 2^18838505 is an apocalyptic number.

It is an amenable number.

18838505 is a deficient number, since it is larger than the sum of its proper divisors (7068439).

18838505 is an equidigital number, since it uses as much as digits as its factorization.

18838505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 18838505 is about 4340.3346645161. The cubic root of 18838505 is about 266.0819889721.

The spelling of 18838505 in words is "eighteen million, eight hundred thirty-eight thousand, five hundred five".