18871105 has 16 divisors (see below), whose sum is σ = 26158464. Its totient is φ = 12916480.

The previous prime is 18871103. The next prime is 18871121. The reversal of 18871105 is 50117881.

It is not a de Polignac number, because 18871105 - 2¹ = 18871103 is a prime.

It is a super-2 number, since 2×18871105² = 712237207842050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18871103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9157 + ... + 11026.

It is an arithmetic number, because the mean of its divisors is an integer number (1634904).

Almost surely, 2^18871105 is an apocalyptic number.

It is an amenable number.

18871105 is a deficient number, since it is larger than the sum of its proper divisors (7287359).

18871105 is a wasteful number, since it uses less digits than its factorization.

18871105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20216.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 18871105 is about 4344.0885119896. The cubic root of 18871105 is about 266.2353853278.

Adding to 18871105 its reverse (50117881), we get a palindrome (68988986).

It can be divided in two parts, 1887 and 1105, that added together give a palindrome (2992).

The spelling of 18871105 in words is "eighteen million, eight hundred seventy-one thousand, one hundred five".