18444000 has 192 divisors, whose sum is σ = 63685440. Its totient is φ = 4659200.

The previous prime is 18443993. The next prime is 18444001. The reversal of 18444000 is 44481.

It is a super-2 number, since 2×18444000² = 680362272000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18444001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 347974 + ... + 348026.

It is an arithmetic number, because the mean of its divisors is an integer number (331695).

Almost surely, 2^18444000 is an apocalyptic number.

18444000 is a gapful number since it is divisible by the number (10) 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 18444000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31842720).

18444000 is an abundant number, since it is smaller than the sum of its proper divisors (45241440).

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

18444000 is a wasteful number, since it uses less digits than its factorization.

18444000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 18444000 is about 4294.6478318950. The cubic root of 18444000 is about 264.2114926016.

Adding to 18444000 its reverse (44481), we get a palindrome (18488481).

The spelling of 18444000 in words is "eighteen million, four hundred forty-four thousand".