22488440 has 64 divisors (see below), whose sum is σ = 55490400. Its totient is φ = 8151552.

The previous prime is 22488439. The next prime is 22488449. The reversal of 22488440 is 4488422.

It is a junction number, because it is equal to n+sod(n) for n = 22488397 and 22488406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22488449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30314 + ... + 31046.

Almost surely, 2^22488440 is an apocalyptic number.

22488440 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 22488440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27745200).

22488440 is an abundant number, since it is smaller than the sum of its proper divisors (33001960).

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

22488440 is a wasteful number, since it uses less digits than its factorization.

22488440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The square root of 22488440 is about 4742.1978027071. The cubic root of 22488440 is about 282.2624520419.

The spelling of 22488440 in words is "twenty-two million, four hundred eighty-eight thousand, four hundred forty".