22243440 has 40 divisors (see below), whose sum is σ = 68955408. Its totient is φ = 5931520.

The previous prime is 22243439. The next prime is 22243447. The reversal of 22243440 is 4434222.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22243447) 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 7 ways as a sum of consecutive naturals, for example, 46101 + ... + 46580.

Almost surely, 2^22243440 is an apocalyptic number.

22243440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22243440 is an abundant number, since it is smaller than the sum of its proper divisors (46711968).

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

22243440 is a wasteful number, since it uses less digits than its factorization.

22243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92697 (or 92691 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 22243440 is about 4716.2951561581. The cubic root of 22243440 is about 281.2336721385.

Adding to 22243440 its reverse (4434222), we get a palindrome (26677662).

The spelling of 22243440 in words is "twenty-two million, two hundred forty-three thousand, four hundred forty".