22040440 has 32 divisors (see below), whose sum is σ = 51749280. Its totient is φ = 8432512.

The previous prime is 22040429. The next prime is 22040441. The reversal of 22040440 is 4404022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22040441) 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, 11059 + ... + 12898.

It is an arithmetic number, because the mean of its divisors is an integer number (1617165).

Almost surely, 2^22040440 is an apocalyptic number.

22040440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22040440 is an abundant number, since it is smaller than the sum of its proper divisors (29708840).

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

22040440 is a wasteful number, since it uses less digits than its factorization.

22040440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23991 (or 23987 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 22040440 is about 4694.7246990638. The cubic root of 22040440 is about 280.3755165663.

Adding to 22040440 its reverse (4404022), we get a palindrome (26444462).

The spelling of 22040440 in words is "twenty-two million, forty thousand, four hundred forty".