18204242 has 16 divisors (see below), whose sum is σ = 32850240. Its totient is φ = 7391088.

The previous prime is 18204233. The next prime is 18204253. The reversal of 18204242 is 24240281.

It is a happy number.

18204242 is a modest number, since divided by 4242 gives 1820 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33953 + ... + 34484.

It is an arithmetic number, because the mean of its divisors is an integer number (2053140).

Almost surely, 2^18204242 is an apocalyptic number.

18204242 is a deficient number, since it is larger than the sum of its proper divisors (14645998).

18204242 is a wasteful number, since it uses less digits than its factorization.

18204242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68465.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18204242 is about 4266.6429426424. The cubic root of 18204242 is about 263.0616461198.

The spelling of 18204242 in words is "eighteen million, two hundred four thousand, two hundred forty-two".