18204090 has 64 divisors (see below), whose sum is σ = 46569600. Its totient is φ = 4541184.

The previous prime is 18204089. The next prime is 18204091. The reversal of 18204090 is 9040281.

It is an interprime number because it is at equal distance from previous prime (18204089) and next prime (18204091).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18204090.

It is not an unprimeable number, because it can be changed into a prime (18204091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61984 + ... + 62276.

It is an arithmetic number, because the mean of its divisors is an integer number (727650).

Almost surely, 2^18204090 is an apocalyptic number.

18204090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18204090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23284800).

18204090 is an abundant number, since it is smaller than the sum of its proper divisors (28365510).

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

18204090 is a wasteful number, since it uses less digits than its factorization.

18204090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18204090 is about 4266.6251300062. The cubic root of 18204090 is about 263.0609139556.

The spelling of 18204090 in words is "eighteen million, two hundred four thousand, ninety".