18018000 has 480 divisors, whose sum is σ = 84494592. Its totient is φ = 3456000.

The previous prime is 18017981. The next prime is 18018017. The reversal of 18018000 is 81081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1385994 + ... + 1386006.

Almost surely, 2^18018000 is an apocalyptic number.

18018000 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 18018000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42247296).

18018000 is an abundant number, since it is smaller than the sum of its proper divisors (66476592).

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

18018000 is a wasteful number, since it uses less digits than its factorization.

18018000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 18018000 is about 4244.7614773978. The cubic root of 18018000 is about 262.1614683642.

Adding to 18018000 its reverse (81081), we get a palindrome (18099081).

It can be divided in two parts, 1801 and 8000, that added together give a square (9801 = 99²).

The spelling of 18018000 in words is "eighteen million, eighteen thousand".