18087818 has 32 divisors (see below), whose sum is σ = 32514048. Its totient is φ = 7383600.

The previous prime is 18087757. The next prime is 18087827. The reversal of 18087818 is 81878081.

It is a super-2 number, since 2×18087818² = 654338320002248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

Together with 14426230 it forms an amicable pair .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30521 + ... + 31107.

It is an arithmetic number, because the mean of its divisors is an integer number (1016064).

Almost surely, 2^18087818 is an apocalyptic number.

18087818 is a deficient number, since it is larger than the sum of its proper divisors (14426230).

18087818 is a wasteful number, since it uses less digits than its factorization.

18087818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698.

The product of its (nonzero) digits is 28672, while the sum is 41.

The square root of 18087818 is about 4252.9775452029. The cubic root of 18087818 is about 262.4996486768.

The spelling of 18087818 in words is "eighteen million, eighty-seven thousand, eight hundred eighteen".