18273312 has 72 divisors (see below), whose sum is σ = 52796016. Its totient is φ = 5993856.

The previous prime is 18273263. The next prime is 18273319. The reversal of 18273312 is 21337281.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (18273319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18823 + ... + 19769.

It is an arithmetic number, because the mean of its divisors is an integer number (733278).

Almost surely, 2^18273312 is an apocalyptic number.

18273312 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 18273312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26398008).

18273312 is an abundant number, since it is smaller than the sum of its proper divisors (34522704).

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

18273312 is a wasteful number, since it uses less digits than its factorization.

18273312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030 (or 1019 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 18273312 is about 4274.7294651241. The cubic root of 18273312 is about 263.3939264862.

The spelling of 18273312 in words is "eighteen million, two hundred seventy-three thousand, three hundred twelve".