18090100 has 72 divisors (see below), whose sum is σ = 45983168. Its totient is φ = 6048000.

The previous prime is 18090097. The next prime is 18090157. The reversal of 18090100 is 109081.

It is a congruent number.

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, 29800 + ... + 30400.

Almost surely, 2^18090100 is an apocalyptic number.

18090100 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 18090100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22991584).

18090100 is an abundant number, since it is smaller than the sum of its proper divisors (27893068).

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

18090100 is a wasteful number, since it uses less digits than its factorization.

18090100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 18090100 is about 4253.2458193714. The cubic root of 18090100 is about 262.5106873956.

Adding to 18090100 its reverse (109081), we get a palindrome (18199181).

The spelling of 18090100 in words is "eighteen million, ninety thousand, one hundred".