18107885 has 4 divisors (see below), whose sum is σ = 21729468. Its totient is φ = 14486304.

The previous prime is 18107879. The next prime is 18107891. The reversal of 18107885 is 58870181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58870181 = 5827 ⋅10103.

It is an interprime number because it is at equal distance from previous prime (18107879) and next prime (18107891).

It can be written as a sum of positive squares in 2 ways, for example, as 13498276 + 4609609 = 3674^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 18107885 - 2²⁰ = 17059309 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1810784 + ... + 1810793.

It is an arithmetic number, because the mean of its divisors is an integer number (5432367).

Almost surely, 2^18107885 is an apocalyptic number.

It is an amenable number.

18107885 is a deficient number, since it is larger than the sum of its proper divisors (3621583).

18107885 is an equidigital number, since it uses as much as digits as its factorization.

18107885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621582.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 18107885 is about 4255.3360619345. The cubic root of 18107885 is about 262.5966869829.

The spelling of 18107885 in words is "eighteen million, one hundred seven thousand, eight hundred eighty-five".