18044400 has 120 divisors (see below), whose sum is σ = 63103104. Its totient is φ = 4371200.

The previous prime is 18044399. The next prime is 18044401. The reversal of 18044400 is 444081.

It is an interprime number because it is at equal distance from previous prime (18044399) and next prime (18044401).

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18044401) 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, 12517 + ... + 13883.

Almost surely, 2^18044400 is an apocalyptic number.

18044400 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 18044400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31551552).

18044400 is an abundant number, since it is smaller than the sum of its proper divisors (45058704).

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

18044400 is a wasteful number, since it uses less digits than its factorization.

18044400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1388 counting only the distinct ones).

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

The square root of 18044400 is about 4247.8700545097. The cubic root of 18044400 is about 262.2894456695.

Adding to 18044400 its reverse (444081), we get a palindrome (18488481).

The spelling of 18044400 in words is "eighteen million, forty-four thousand, four hundred".