18087106 has 4 divisors (see below), whose sum is σ = 27130662. Its totient is φ = 9043552.

The previous prime is 18087103. The next prime is 18087169. The reversal of 18087106 is 60178081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 67081 = 4245^2 + 259^2 .

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 pancake number, because a pancake can be divided into 18087106 parts by 6014 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (18087101) by changing a digit.

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 as a sum of consecutive naturals, namely, 4521775 + ... + 4521778.

Almost surely, 2^18087106 is an apocalyptic number.

18087106 is a deficient number, since it is larger than the sum of its proper divisors (9043556).

18087106 is an equidigital number, since it uses as much as digits as its factorization.

18087106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9043555.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 18087106 is about 4252.8938383176. The cubic root of 18087106 is about 262.4962043291.

The spelling of 18087106 in words is "eighteen million, eighty-seven thousand, one hundred six".