18013800 has 96 divisors (see below), whose sum is σ = 63835200. Its totient is φ = 4116480.

The previous prime is 18013781. The next prime is 18013813. The reversal of 18013800 is 831081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2056 + ... + 6344.

It is an arithmetic number, because the mean of its divisors is an integer number (664950).

Almost surely, 2^18013800 is an apocalyptic number.

18013800 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 18013800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31917600).

18013800 is an abundant number, since it is smaller than the sum of its proper divisors (45821400).

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

18013800 is a wasteful number, since it uses less digits than its factorization.

18013800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4315 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 18013800 is about 4244.2667211192. The cubic root of 18013800 is about 262.1410968148.

Adding to 18013800 its reverse (831081), we get a palindrome (18844881).

The spelling of 18013800 in words is "eighteen million, thirteen thousand, eight hundred".