18213234 has 32 divisors (see below), whose sum is σ = 39432960. Its totient is φ = 5574912.

The previous prime is 18213233. The next prime is 18213253. The reversal of 18213234 is 43231281.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18213233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18154 + ... + 19130.

It is an arithmetic number, because the mean of its divisors is an integer number (1232280).

Almost surely, 2^18213234 is an apocalyptic number.

18213234 is an abundant number, since it is smaller than the sum of its proper divisors (21219726).

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

18213234 is a wasteful number, since it uses less digits than its factorization.

18213234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234.

The product of its digits is 1152, while the sum is 24.

The square root of 18213234 is about 4267.6965684078. The cubic root of 18213234 is about 263.1049521609.

The spelling of 18213234 in words is "eighteen million, two hundred thirteen thousand, two hundred thirty-four".