22439538 has 64 divisors (see below), whose sum is σ = 55923840. Its totient is φ = 6609600.

The previous prime is 22439519. The next prime is 22439561. The reversal of 22439538 is 83593422.

22439538 is a Rhonda number in base 8.

Its product of digits (51840) is a multiple of the sum of its prime factors (1080).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 21468 + ... + 22488.

It is an arithmetic number, because the mean of its divisors is an integer number (873810).

Almost surely, 2^22439538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22439538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27961920).

22439538 is an abundant number, since it is smaller than the sum of its proper divisors (33484302).

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

22439538 is a wasteful number, since it uses less digits than its factorization.

22439538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1074 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 22439538 is about 4737.0389485416. The cubic root of 22439538 is about 282.0577066151.

It can be divided in two parts, 2243 and 9538, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 22439538 in words is "twenty-two million, four hundred thirty-nine thousand, five hundred thirty-eight".