18818000 has 60 divisors (see below), whose sum is σ = 45975852. Its totient is φ = 7449600.

The previous prime is 18817993. The next prime is 18818029. The reversal of 18818000 is 81881.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 7011904 + 11806096 = 2648^2 + 3436^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193952 + ... + 194048.

Almost surely, 2^18818000 is an apocalyptic number.

18818000 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 18818000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22987926).

18818000 is an abundant number, since it is smaller than the sum of its proper divisors (27157852).

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

18818000 is an frugal number, since it uses more digits than its factorization.

18818000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 26.

The square root of 18818000 is about 4337.9718763496. The cubic root of 18818000 is about 265.9854138647.

Adding to 18818000 its reverse (81881), we get a palindrome (18899881).

The spelling of 18818000 in words is "eighteen million, eight hundred eighteen thousand".