22404522 has 32 divisors (see below), whose sum is σ = 51835392. Its totient is φ = 6323184.

The previous prime is 22404497. The next prime is 22404523. The reversal of 22404522 is 22540422.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22404523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273 + ... + 6699.

It is an arithmetic number, because the mean of its divisors is an integer number (1619856).

Almost surely, 2^22404522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22404522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25917696).

22404522 is an abundant number, since it is smaller than the sum of its proper divisors (29430870).

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

22404522 is a wasteful number, since it uses less digits than its factorization.

22404522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6522.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 22404522 is about 4733.3415258145. The cubic root of 22404522 is about 281.9109169854.

Adding to 22404522 its reverse (22540422), we get a palindrome (44944944).

The spelling of 22404522 in words is "twenty-two million, four hundred four thousand, five hundred twenty-two".