18000004 has 24 divisors (see below), whose sum is σ = 34499808. Its totient is φ = 8149440.

The previous prime is 17999987. The next prime is 18000041. The reversal of 18000004 is 40000081.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13119 + ... + 14425.

It is an arithmetic number, because the mean of its divisors is an integer number (1437492).

Almost surely, 2^18000004 is an apocalyptic number.

It is an amenable number.

18000004 is a deficient number, since it is larger than the sum of its proper divisors (16499804).

18000004 is a wasteful number, since it uses less digits than its factorization.

18000004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 18000004 is about 4242.6411585238. The cubic root of 18000004 is about 262.0741588338.

Adding to 18000004 its reverse (40000081), we get a palindrome (58000085).

The spelling of 18000004 in words is "eighteen million, four", and thus it is an aban number.