22440140 has 24 divisors (see below), whose sum is σ = 49605360. Its totient is φ = 8503488.

The previous prime is 22440137. The next prime is 22440149. The reversal of 22440140 is 4104422.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (22440149) 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, 29147 + ... + 29906.

It is an arithmetic number, because the mean of its divisors is an integer number (2066890).

Almost surely, 2^22440140 is an apocalyptic number.

22440140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22440140 is an abundant number, since it is smaller than the sum of its proper divisors (27165220).

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

22440140 is a wasteful number, since it uses less digits than its factorization.

22440140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59081 (or 59079 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 22440140 is about 4737.1024899193. The cubic root of 22440140 is about 282.0602289074.

Adding to 22440140 its reverse (4104422), we get a palindrome (26544562).

The spelling of 22440140 in words is "twenty-two million, four hundred forty thousand, one hundred forty".