18099036 has 72 divisors (see below), whose sum is σ = 47515104. Its totient is φ = 5806080.

The previous prime is 18099013. The next prime is 18099041. The reversal of 18099036 is 63099081.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 186540 + ... + 186636.

It is an arithmetic number, because the mean of its divisors is an integer number (659932).

Almost surely, 2^18099036 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 18099036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23757552).

18099036 is an abundant number, since it is smaller than the sum of its proper divisors (29416068).

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

18099036 is a wasteful number, since it uses less digits than its factorization.

18099036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 18099036 is about 4254.2961815088. The cubic root of 18099036 is about 262.5539045762.

The spelling of 18099036 in words is "eighteen million, ninety-nine thousand, thirty-six".