18168732 has 48 divisors (see below), whose sum is σ = 48736800. Its totient is φ = 5846400.

The previous prime is 18168721. The next prime is 18168737. The reversal of 18168732 is 23786181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232 + ... + 6032.

It is an arithmetic number, because the mean of its divisors is an integer number (1015350).

Almost surely, 2^18168732 is an apocalyptic number.

18168732 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 18168732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24368400).

18168732 is an abundant number, since it is smaller than the sum of its proper divisors (30568068).

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

18168732 is a wasteful number, since it uses less digits than its factorization.

18168732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843 (or 5835 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18168732 is about 4262.4795600683. The cubic root of 18168732 is about 262.8904882195.

The spelling of 18168732 in words is "eighteen million, one hundred sixty-eight thousand, seven hundred thirty-two".