18225100 has 36 divisors (see below), whose sum is σ = 40231800. Its totient is φ = 7164160.

The previous prime is 18225091. The next prime is 18225133. The reversal of 18225100 is 152281.

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, 4356 + ... + 7444.

It is an arithmetic number, because the mean of its divisors is an integer number (1117550).

Almost surely, 2^18225100 is an apocalyptic number.

18225100 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 18225100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20115900).

18225100 is an abundant number, since it is smaller than the sum of its proper divisors (22006700).

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

18225100 is a wasteful number, since it uses less digits than its factorization.

18225100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162 (or 3155 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18225100 is about 4269.0865533507. The cubic root of 18225100 is about 263.1620777581.

Adding to 18225100 its reverse (152281), we get a palindrome (18377381).

The spelling of 18225100 in words is "eighteen million, two hundred twenty-five thousand, one hundred".