18022400 has 102 divisors (see below), whose sum is σ = 48758412. Its totient is φ = 6553600.

The previous prime is 18022399. The next prime is 18022429. The reversal of 18022400 is 422081.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1638395 + ... + 1638405.

Almost surely, 2^18022400 is an apocalyptic number.

18022400 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 18022400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24379206).

18022400 is an abundant number, since it is smaller than the sum of its proper divisors (30736012).

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

18022400 is an frugal number, since it uses more digits than its factorization.

18022400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 18022400 is about 4245.2797316549. The cubic root of 18022400 is about 262.1828065922.

Adding to 18022400 its reverse (422081), we get a palindrome (18444481).

The spelling of 18022400 in words is "eighteen million, twenty-two thousand, four hundred".