22440240 has 100 divisors (see below), whose sum is σ = 77960784. Its totient is φ = 5982336.

The previous prime is 22440239. The next prime is 22440247. The reversal of 22440240 is 4204422.

22440240 is a `hidden beast` number, since 224 + 402 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22440247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4749 + ... + 8211.

Almost surely, 2^22440240 is an apocalyptic number.

22440240 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 22440240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38980392).

22440240 is an abundant number, since it is smaller than the sum of its proper divisors (55520544).

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

22440240 is a wasteful number, since it uses less digits than its factorization.

22440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488 (or 3473 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 22440240 is about 4737.1130448829. The cubic root of 22440240 is about 282.0606478885.

Adding to 22440240 its reverse (4204422), we get a palindrome (26644662).

The spelling of 22440240 in words is "twenty-two million, four hundred forty thousand, two hundred forty".