18001115 has 16 divisors (see below), whose sum is σ = 23747040. Its totient is φ = 12990720.

The previous prime is 18001099. The next prime is 18001117. The reversal of 18001115 is 51110081.

It is not a de Polignac number, because 18001115 - 2⁴ = 18001099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18001093 and 18001102.

It is not an unprimeable number, because it can be changed into a prime (18001117) 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 in 15 ways as a sum of consecutive naturals, for example, 6341 + ... + 8729.

It is an arithmetic number, because the mean of its divisors is an integer number (1484190).

Almost surely, 2^18001115 is an apocalyptic number.

18001115 is a deficient number, since it is larger than the sum of its proper divisors (5745925).

18001115 is a wasteful number, since it uses less digits than its factorization.

18001115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542.

The product of its (nonzero) digits is 40, while the sum is 17.

The square root of 18001115 is about 4242.7720890946. The cubic root of 18001115 is about 262.0795506548.

Adding to 18001115 its reverse (51110081), we get a palindrome (69111196).

The spelling of 18001115 in words is "eighteen million, one thousand, one hundred fifteen".