18422404 has 96 divisors (see below), whose sum is σ = 44706816. Its totient is φ = 6410880.

The previous prime is 18422389. The next prime is 18422479. The reversal of 18422404 is 40422481.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172119 + ... + 172225.

It is an arithmetic number, because the mean of its divisors is an integer number (465696).

Almost surely, 2^18422404 is an apocalyptic number.

18422404 is a gapful number since it is divisible by the number (14) 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 18422404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22353408).

18422404 is an abundant number, since it is smaller than the sum of its proper divisors (26284412).

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

18422404 is a wasteful number, since it uses less digits than its factorization.

18422404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 18422404 is about 4292.1328031644. The cubic root of 18422404 is about 264.1083309618.

Adding to 18422404 its reverse (40422481), we get a palindrome (58844885).

The spelling of 18422404 in words is "eighteen million, four hundred twenty-two thousand, four hundred four".