18017944 has 64 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 7326720.

The previous prime is 18017941. The next prime is 18017953. The reversal of 18017944 is 44971081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18017941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168339 + ... + 168445.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^18017944 is an apocalyptic number.

18017944 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 18017944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20321280).

18017944 is an abundant number, since it is smaller than the sum of its proper divisors (22624616).

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

18017944 is a wasteful number, since it uses less digits than its factorization.

18017944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18017944 is about 4244.7548810267. The cubic root of 18017944 is about 262.1611967643.

The spelling of 18017944 in words is "eighteen million, seventeen thousand, nine hundred forty-four".