18861105 has 16 divisors (see below), whose sum is σ = 30348864. Its totient is φ = 10002240.

The previous prime is 18861097. The next prime is 18861121. The reversal of 18861105 is 50116881.

It is a happy number.

It is not a de Polignac number, because 18861105 - 2³ = 18861097 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 759 + ... + 6188.

It is an arithmetic number, because the mean of its divisors is an integer number (1896804).

Almost surely, 2^18861105 is an apocalyptic number.

18861105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18861105 is a deficient number, since it is larger than the sum of its proper divisors (11487759).

18861105 is a wasteful number, since it uses less digits than its factorization.

18861105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 18861105 is about 4342.9373700296. The cubic root of 18861105 is about 266.1883500277.

Adding to 18861105 its reverse (50116881), we get a palindrome (68977986).

The spelling of 18861105 in words is "eighteen million, eight hundred sixty-one thousand, one hundred five".