18188105 has 8 divisors (see below), whose sum is σ = 23504712. Its totient is φ = 13431168.

The previous prime is 18188087. The next prime is 18188123. The reversal of 18188105 is 50188181.

It is an interprime number because it is at equal distance from previous prime (18188087) and next prime (18188123).

It can be written as a sum of positive squares in 4 ways, for example, as 1056784 + 17131321 = 1028^2 + 4139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18188105 - 2¹² = 18184009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139844 + ... + 139973.

It is an arithmetic number, because the mean of its divisors is an integer number (2938089).

Almost surely, 2^18188105 is an apocalyptic number.

It is an amenable number.

18188105 is a deficient number, since it is larger than the sum of its proper divisors (5316607).

18188105 is a wasteful number, since it uses less digits than its factorization.

18188105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279835.

The product of its (nonzero) digits is 2560, while the sum is 32.

The square root of 18188105 is about 4264.7514581743. The cubic root of 18188105 is about 262.9838935329.

The spelling of 18188105 in words is "eighteen million, one hundred eighty-eight thousand, one hundred five".