18439212 has 48 divisors (see below), whose sum is σ = 47279232. Its totient is φ = 5546880.

The previous prime is 18439207. The next prime is 18439219. The reversal of 18439212 is 21293481.

It is a self number, because there is not a number n which added to its sum of digits gives 18439212.

It is not an unprimeable number, because it can be changed into a prime (18439219) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21088 + ... + 21944.

It is an arithmetic number, because the mean of its divisors is an integer number (984984).

Almost surely, 2^18439212 is an apocalyptic number.

18439212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18439212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23639616).

18439212 is an abundant number, since it is smaller than the sum of its proper divisors (28840020).

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

18439212 is a wasteful number, since it uses less digits than its factorization.

18439212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1036 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 18439212 is about 4294.0903576893. The cubic root of 18439212 is about 264.1886278197.

The spelling of 18439212 in words is "eighteen million, four hundred thirty-nine thousand, two hundred twelve".