22225440 has 96 divisors (see below), whose sum is σ = 73725120. Its totient is φ = 5612544.

The previous prime is 22225439. The next prime is 22225447. The reversal of 22225440 is 4452222.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (22225447) 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, 7902 + ... + 10338.

It is an arithmetic number, because the mean of its divisors is an integer number (767970).

Almost surely, 2^22225440 is an apocalyptic number.

22225440 is a gapful number since it is divisible by the number (20) 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 22225440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36862560).

22225440 is an abundant number, since it is smaller than the sum of its proper divisors (51499680).

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

22225440 is a wasteful number, since it uses less digits than its factorization.

22225440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474 (or 2466 counting only the distinct ones).

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

The square root of 22225440 is about 4714.3864924293. The cubic root of 22225440 is about 281.1577910068.

Adding to 22225440 its reverse (4452222), we get a palindrome (26677662).

The spelling of 22225440 in words is "twenty-two million, two hundred twenty-five thousand, four hundred forty".