18343312 has 40 divisors (see below), whose sum is σ = 39606840. Its totient is φ = 8171520.

The previous prime is 18343291. The next prime is 18343313. The reversal of 18343312 is 21334381.

It can be written as a sum of positive squares in 4 ways, for example, as 4682896 + 13660416 = 2164^2 + 3696^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18343313) 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, 4512 + ... + 7552.

It is an arithmetic number, because the mean of its divisors is an integer number (990171).

Almost surely, 2^18343312 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 18343312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19803420).

18343312 is an abundant number, since it is smaller than the sum of its proper divisors (21263528).

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

18343312 is a wasteful number, since it uses less digits than its factorization.

18343312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091 (or 3085 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 18343312 is about 4282.9092915914. The cubic root of 18343312 is about 263.7298276764.

Adding to 18343312 its reverse (21334381), we get a palindrome (39677693).

The spelling of 18343312 in words is "eighteen million, three hundred forty-three thousand, three hundred twelve".