18171144 has 96 divisors (see below), whose sum is σ = 53352000. Its totient is φ = 5567616.

The previous prime is 18171121. The next prime is 18171149. The reversal of 18171144 is 44117181.

18171144 = T₄₁₁ + T₄₁₂ + ... + T₅₆₂.

It is not an unprimeable number, because it can be changed into a prime (18171149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50437 + ... + 50795.

It is an arithmetic number, because the mean of its divisors is an integer number (555750).

Almost surely, 2^18171144 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 18171144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26676000).

18171144 is an abundant number, since it is smaller than the sum of its proper divisors (35180856).

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

18171144 is a wasteful number, since it uses less digits than its factorization.

18171144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 420 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 18171144 is about 4262.7624845867. The cubic root of 18171144 is about 262.9021210952.

The spelling of 18171144 in words is "eighteen million, one hundred seventy-one thousand, one hundred forty-four".