18098900 has 54 divisors (see below), whose sum is σ = 41149710. Its totient is φ = 6901440.

The previous prime is 18098891. The next prime is 18098909. The reversal of 18098900 is 989081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18098891) and next prime (18098909).

It can be written as a sum of positive squares in 3 ways, for example, as 1223236 + 16875664 = 1106^2 + 4108^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18098909) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 229061 + ... + 229139.

Almost surely, 2^18098900 is an apocalyptic number.

18098900 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 18098900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20574855).

18098900 is an abundant number, since it is smaller than the sum of its proper divisors (23050810).

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

18098900 is a wasteful number, since it uses less digits than its factorization.

18098900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 18098900 is about 4254.2801976363. The cubic root of 18098900 is about 262.5532469459.

The spelling of 18098900 in words is "eighteen million, ninety-eight thousand, nine hundred".