18000003 has 12 divisors (see below), whose sum is σ = 27918600. Its totient is φ = 10285632.

The previous prime is 17999987. The next prime is 18000041. The reversal of 18000003 is 30000081.

It is not a de Polignac number, because 18000003 - 2⁴ = 17999987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61078 + ... + 61371.

It is an arithmetic number, because the mean of its divisors is an integer number (2326550).

Almost surely, 2^18000003 is an apocalyptic number.

18000003 is a deficient number, since it is larger than the sum of its proper divisors (9918597).

18000003 is a wasteful number, since it uses less digits than its factorization.

18000003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122466 (or 122459 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 18000003 is about 4242.6410406727. The cubic root of 18000003 is about 262.0741539806.

Adding to 18000003 its reverse (30000081), we get a palindrome (48000084).

The spelling of 18000003 in words is "eighteen million, three", and thus it is an aban number and an uban number.