18051312 has 40 divisors (see below), whose sum is σ = 47125456. Its totient is φ = 5953536.

The previous prime is 18051289. The next prime is 18051317. The reversal of 18051312 is 21315081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18051317) 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 7 ways as a sum of consecutive naturals, for example, 2718 + ... + 6594.

Almost surely, 2^18051312 is an apocalyptic number.

18051312 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 18051312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23562728).

18051312 is an abundant number, since it is smaller than the sum of its proper divisors (29074144).

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

18051312 is a wasteful number, since it uses less digits than its factorization.

18051312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985 (or 3979 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 18051312 is about 4248.6835608221. The cubic root of 18051312 is about 262.3229318335.

Adding to 18051312 its reverse (21315081), we get a palindrome (39366393).

The spelling of 18051312 in words is "eighteen million, fifty-one thousand, three hundred twelve".