18244404 has 36 divisors (see below), whose sum is σ = 47367684. Its totient is φ = 5916672.

The previous prime is 18244403. The next prime is 18244409. The reversal of 18244404 is 40444281.

It is a happy number.

18244404 is a `hidden beast` number, since 18 + 244 + 404 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7551504 + 10692900 = 2748^2 + 3270^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18244403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5517 + ... + 8180.

It is an arithmetic number, because the mean of its divisors is an integer number (1315769).

Almost surely, 2^18244404 is an apocalyptic number.

It is an amenable number.

18244404 is an abundant number, since it is smaller than the sum of its proper divisors (29123280).

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

18244404 is a wasteful number, since it uses less digits than its factorization.

18244404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13744 (or 13739 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 18244404 is about 4271.3468601836. The cubic root of 18244404 is about 263.2549586055.

Adding to 18244404 its reverse (40444281), we get a palindrome (58688685).

The spelling of 18244404 in words is "eighteen million, two hundred forty-four thousand, four hundred four".