18885505 has 4 divisors (see below), whose sum is σ = 22662612. Its totient is φ = 15108400.

The previous prime is 18885499. The next prime is 18885509. The reversal of 18885505 is 50558881.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10452289 + 8433216 = 3233^2 + 2904^2 .

It is not a de Polignac number, because 18885505 - 2³ = 18885497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18885509) 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, 1888546 + ... + 1888555.

It is an arithmetic number, because the mean of its divisors is an integer number (5665653).

Almost surely, 2^18885505 is an apocalyptic number.

It is an amenable number.

18885505 is a deficient number, since it is larger than the sum of its proper divisors (3777107).

18885505 is an equidigital number, since it uses as much as digits as its factorization.

18885505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777106.

The product of its (nonzero) digits is 64000, while the sum is 40.

The square root of 18885505 is about 4345.7456207192. The cubic root of 18885505 is about 266.3030869774.

The spelling of 18885505 in words is "eighteen million, eight hundred eighty-five thousand, five hundred five".