22539944 has 32 divisors (see below), whose sum is σ = 48988800. Its totient is φ = 9522240.

The previous prime is 22539941. The next prime is 22539949. The reversal of 22539944 is 44993522.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22539898 and 22539907.

It is not an unprimeable number, because it can be changed into a prime (22539941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1142 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (1530900).

Almost surely, 2^22539944 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 22539944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24494400).

22539944 is an abundant number, since it is smaller than the sum of its proper divisors (26448856).

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

22539944 is a wasteful number, since it uses less digits than its factorization.

22539944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753 (or 5749 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 22539944 is about 4747.6250905058. The cubic root of 22539944 is about 282.4777709817.

The spelling of 22539944 in words is "twenty-two million, five hundred thirty-nine thousand, nine hundred forty-four".