18043212 has 24 divisors (see below), whose sum is σ = 45928512. Its totient is φ = 5467600.

The previous prime is 18043189. The next prime is 18043213. The reversal of 18043212 is 21234081.

It is not an unprimeable number, because it can be changed into a prime (18043213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68214 + ... + 68477.

It is an arithmetic number, because the mean of its divisors is an integer number (1913688).

Almost surely, 2^18043212 is an apocalyptic number.

18043212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18043212 is an abundant number, since it is smaller than the sum of its proper divisors (27885300).

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

18043212 is a wasteful number, since it uses less digits than its factorization.

18043212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136709 (or 136707 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18043212 is about 4247.7302174220. The cubic root of 18043212 is about 262.2836893739.

Adding to 18043212 its reverse (21234081), we get a palindrome (39277293).

The spelling of 18043212 in words is "eighteen million, forty-three thousand, two hundred twelve".