18543012 has 48 divisors (see below), whose sum is σ = 45911040. Its totient is φ = 5808672.

The previous prime is 18543011. The next prime is 18543023. The reversal of 18543012 is 21034581.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18543011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37833 + ... + 38319.

It is an arithmetic number, because the mean of its divisors is an integer number (956480).

Almost surely, 2^18543012 is an apocalyptic number.

18543012 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 18543012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22955520).

18543012 is an abundant number, since it is smaller than the sum of its proper divisors (27368028).

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

18543012 is a wasteful number, since it uses less digits than its factorization.

18543012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 18543012 is about 4306.1597740911. The cubic root of 18543012 is about 264.6834335414.

Adding to 18543012 its reverse (21034581), we get a palindrome (39577593).

The spelling of 18543012 in words is "eighteen million, five hundred forty-three thousand, twelve".