18510018 has 16 divisors (see below), whose sum is σ = 37074240. Its totient is φ = 6160976.

The previous prime is 18510013. The next prime is 18510031. The reversal of 18510018 is 81001581.

It is a self number, because there is not a number n which added to its sum of digits gives 18510018.

It is not an unprimeable number, because it can be changed into a prime (18510013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3196 + ... + 6872.

It is an arithmetic number, because the mean of its divisors is an integer number (2317140).

Almost surely, 2^18510018 is an apocalyptic number.

18510018 is an abundant number, since it is smaller than the sum of its proper divisors (18564222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18510018 is a wasteful number, since it uses less digits than its factorization.

18510018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521.

The product of its (nonzero) digits is 320, while the sum is 24.

The square root of 18510018 is about 4302.3270447515. The cubic root of 18510018 is about 264.5263546030.

Adding to 18510018 its reverse (81001581), we get a palindrome (99511599).

The spelling of 18510018 in words is "eighteen million, five hundred ten thousand, eighteen".