18328212 has 72 divisors (see below), whose sum is σ = 53342016. Its totient is φ = 5197824.

The previous prime is 18328201. The next prime is 18328231. The reversal of 18328212 is 21282381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64623 + ... + 64905.

Almost surely, 2^18328212 is an apocalyptic number.

18328212 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 18328212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26671008).

18328212 is an abundant number, since it is smaller than the sum of its proper divisors (35013804).

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

18328212 is a wasteful number, since it uses less digits than its factorization.

18328212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 552 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 18328212 is about 4281.1461082285. The cubic root of 18328212 is about 263.6574413732.

The spelling of 18328212 in words is "eighteen million, three hundred twenty-eight thousand, two hundred twelve".