22439440 has 40 divisors (see below), whose sum is σ = 52496640. Its totient is φ = 8919936.

The previous prime is 22439429. The next prime is 22439489. The reversal of 22439440 is 4493422.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 22439399 and 22439408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13537 + ... + 15103.

It is an arithmetic number, because the mean of its divisors is an integer number (1312416).

Almost surely, 2^22439440 is an apocalyptic number.

22439440 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 22439440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26248320).

22439440 is an abundant number, since it is smaller than the sum of its proper divisors (30057200).

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

22439440 is a wasteful number, since it uses less digits than its factorization.

22439440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 22439440 is about 4737.0286045157. The cubic root of 22439440 is about 282.0572960051.

The spelling of 22439440 in words is "twenty-two million, four hundred thirty-nine thousand, four hundred forty".