18171944 has 48 divisors (see below), whose sum is σ = 40027680. Its totient is φ = 7711200.

The previous prime is 18171943. The next prime is 18171949. The reversal of 18171944 is 44917181.

It is not an unprimeable number, because it can be changed into a prime (18171943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59039 + ... + 59345.

It is an arithmetic number, because the mean of its divisors is an integer number (833910).

Almost surely, 2^18171944 is an apocalyptic number.

18171944 is a gapful number since it is divisible by the number (14) 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 18171944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20013840).

18171944 is an abundant number, since it is smaller than the sum of its proper divisors (21855736).

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

18171944 is a wasteful number, since it uses less digits than its factorization.

18171944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 467 counting only the distinct ones).

The product of its digits is 8064, while the sum is 35.

The square root of 18171944 is about 4262.8563194178. The cubic root of 18171944 is about 262.9059792014.

The spelling of 18171944 in words is "eighteen million, one hundred seventy-one thousand, nine hundred forty-four".