22123840 has 56 divisors (see below), whose sum is σ = 53839872. Its totient is φ = 8655360.

The previous prime is 22123837. The next prime is 22123841. The reversal of 22123840 is 4832122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22123841) 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, 14305 + ... + 15775.

Almost surely, 2^22123840 is an apocalyptic number.

22123840 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 22123840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26919936).

22123840 is an abundant number, since it is smaller than the sum of its proper divisors (31716032).

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

22123840 is a wasteful number, since it uses less digits than its factorization.

22123840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 22123840 is about 4703.5986223316. The cubic root of 22123840 is about 280.7287140846.

Adding to 22123840 its reverse (4832122), we get a palindrome (26955962).

The spelling of 22123840 in words is "twenty-two million, one hundred twenty-three thousand, eight hundred forty".