18000002 has 8 divisors (see below), whose sum is σ = 27442812. Its totient is φ = 8852400.

The previous prime is 17999987. The next prime is 18000041. The reversal of 18000002 is 20000081.

It can be written as a sum of positive squares in 2 ways, for example, as 12187081 + 5812921 = 3491^2 + 2411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73649 + ... + 73892.

Almost surely, 2^18000002 is an apocalyptic number.

18000002 is a deficient number, since it is larger than the sum of its proper divisors (9442810).

18000002 is a wasteful number, since it uses less digits than its factorization.

18000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147604.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 18000002 is about 4242.6409228215. The cubic root of 18000002 is about 262.0741491273.

Adding to 18000002 its reverse (20000081), we get a palindrome (38000083).

The spelling of 18000002 in words is "eighteen million, two", and thus it is an aban number and an uban number.