18745105 has 4 divisors (see below), whose sum is σ = 22494132. Its totient is φ = 14996080.

The previous prime is 18745099. The next prime is 18745121. The reversal of 18745105 is 50154781.

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 12559936 + 6185169 = 3544^2 + 2487^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18745105 is a prime.

It is a super-2 number, since 2×18745105² = 702757922922050, which contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874506 + ... + 1874515.

It is an arithmetic number, because the mean of its divisors is an integer number (5623533).

Almost surely, 2^18745105 is an apocalyptic number.

It is an amenable number.

18745105 is a deficient number, since it is larger than the sum of its proper divisors (3749027).

18745105 is an equidigital number, since it uses as much as digits as its factorization.

18745105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749026.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 18745105 is about 4329.5617561134. The cubic root of 18745105 is about 265.6415215560.

Adding to 18745105 its reverse (50154781), we get a palindrome (68899886).

The spelling of 18745105 in words is "eighteen million, seven hundred forty-five thousand, one hundred five".