22140444 has 48 divisors (see below), whose sum is σ = 54528768. Its totient is φ = 6978048.

The previous prime is 22140439. The next prime is 22140449. The reversal of 22140444 is 44404122.

It is an interprime number because it is at equal distance from previous prime (22140439) and next prime (22140449).

It is a self number, because there is not a number n which added to its sum of digits gives 22140444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22140449) 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, 26359 + ... + 27185.

It is an arithmetic number, because the mean of its divisors is an integer number (1136016).

Almost surely, 2^22140444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22140444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27264384).

22140444 is an abundant number, since it is smaller than the sum of its proper divisors (32388324).

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

22140444 is a wasteful number, since it uses less digits than its factorization.

22140444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 22140444 is about 4705.3633228477. The cubic root of 22140444 is about 280.7989257351.

Adding to 22140444 its reverse (44404122), we get a palindrome (66544566).

The spelling of 22140444 in words is "twenty-two million, one hundred forty thousand, four hundred forty-four".