18428312 has 48 divisors (see below), whose sum is σ = 40998960. Its totient is φ = 7740096.

The previous prime is 18428297. The next prime is 18428321. The reversal of 18428312 is 21382481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20333 + ... + 21219.

It is an arithmetic number, because the mean of its divisors is an integer number (854145).

Almost surely, 2^18428312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18428312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20499480).

18428312 is an abundant number, since it is smaller than the sum of its proper divisors (22570648).

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

18428312 is a wasteful number, since it uses less digits than its factorization.

18428312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 949 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 18428312 is about 4292.8209839219. The cubic root of 18428312 is about 264.1365608144.

The spelling of 18428312 in words is "eighteen million, four hundred twenty-eight thousand, three hundred twelve".