18043818 has 16 divisors (see below), whose sum is σ = 38863776. Its totient is φ = 5551920.

The previous prime is 18043801. The next prime is 18043841. The reversal of 18043818 is 81834081.

It is a happy number.

It is a Curzon number.

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, 115588 + ... + 115743.

It is an arithmetic number, because the mean of its divisors is an integer number (2428986).

Almost surely, 2^18043818 is an apocalyptic number.

18043818 is an abundant number, since it is smaller than the sum of its proper divisors (20819958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18043818 is a wasteful number, since it uses less digits than its factorization.

18043818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231349.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 18043818 is about 4247.8015490369. The cubic root of 18043818 is about 262.2866256977.

Adding to 18043818 its reverse (81834081), we get a palindrome (99877899).

The spelling of 18043818 in words is "eighteen million, forty-three thousand, eight hundred eighteen".