18011136 has 176 divisors, whose sum is σ = 57774528. Its totient is φ = 4915200.

The previous prime is 18011113. The next prime is 18011137. The reversal of 18011136 is 63111081.

It is a tau number, because it is divible by the number of its divisors (176).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18011137) 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 15 ways as a sum of consecutive naturals, for example, 439276 + ... + 439316.

Almost surely, 2^18011136 is an apocalyptic number.

18011136 is a gapful number since it is divisible by the number (16) 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 18011136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28887264).

18011136 is an abundant number, since it is smaller than the sum of its proper divisors (39763392).

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

18011136 is a wasteful number, since it uses less digits than its factorization.

18011136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 18011136 is about 4243.9528743849. The cubic root of 18011136 is about 262.1281737908.

The spelling of 18011136 in words is "eighteen million, eleven thousand, one hundred thirty-six".