22405440 has 56 divisors (see below), whose sum is σ = 71140320. Its totient is φ = 5974528.

The previous prime is 22405421. The next prime is 22405441. The reversal of 22405440 is 4450422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22405441) 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, 10710 + ... + 12629.

Almost surely, 2^22405440 is an apocalyptic number.

22405440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22405440 is an abundant number, since it is smaller than the sum of its proper divisors (48734880).

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

22405440 is a wasteful number, since it uses less digits than its factorization.

22405440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23359 (or 23349 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 22405440 is about 4733.4384964843. The cubic root of 22405440 is about 281.9147672600.

Adding to 22405440 its reverse (4450422), we get a palindrome (26855862).

The spelling of 22405440 in words is "twenty-two million, four hundred five thousand, four hundred forty".