18243684 has 48 divisors (see below), whose sum is σ = 47557440. Its totient is φ = 6048000.

The previous prime is 18243683. The next prime is 18243689. The reversal of 18243684 is 48634281.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18243683) 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, 26772 + ... + 27444.

It is an arithmetic number, because the mean of its divisors is an integer number (990780).

Almost surely, 2^18243684 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 18243684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23778720).

18243684 is an abundant number, since it is smaller than the sum of its proper divisors (29313756).

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

18243684 is a wasteful number, since it uses less digits than its factorization.

18243684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937 (or 929 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 18243684 is about 4271.2625768033. The cubic root of 18243684 is about 263.2514955151.

The spelling of 18243684 in words is "eighteen million, two hundred forty-three thousand, six hundred eighty-four".