18089736 has 128 divisors (see below), whose sum is σ = 55296000. Its totient is φ = 4822272.

The previous prime is 18089723. The next prime is 18089737. The reversal of 18089736 is 63798081.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18089737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228945 + ... + 229023.

It is an arithmetic number, because the mean of its divisors is an integer number (432000).

Almost surely, 2^18089736 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 18089736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27648000).

18089736 is an abundant number, since it is smaller than the sum of its proper divisors (37206264).

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

18089736 is a wasteful number, since it uses less digits than its factorization.

18089736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18089736 is about 4253.2030283070. The cubic root of 18089736 is about 262.5089266806.

The spelling of 18089736 in words is "eighteen million, eighty-nine thousand, seven hundred thirty-six".