18003105 has 12 divisors (see below), whose sum is σ = 31205460. Its totient is φ = 9601632.

The previous prime is 18003079. The next prime is 18003121. The reversal of 18003105 is 50130081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3873024 + 14130081 = 1968^2 + 3759^2 .

It is not a de Polignac number, because 18003105 - 2⁸ = 18002849 is a prime.

It is a super-2 number, since 2×18003105² = 648223579282050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199990 + ... + 200079.

It is an arithmetic number, because the mean of its divisors is an integer number (2600455).

Almost surely, 2^18003105 is an apocalyptic number.

18003105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18003105 is a deficient number, since it is larger than the sum of its proper divisors (13202355).

18003105 is a wasteful number, since it uses less digits than its factorization.

18003105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400080 (or 400077 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 18003105 is about 4243.0065990993. The cubic root of 18003105 is about 262.0892078175.

Adding to 18003105 its reverse (50130081), we get a palindrome (68133186).

The spelling of 18003105 in words is "eighteen million, three thousand, one hundred five".