22421840 has 40 divisors (see below), whose sum is σ = 59579520. Its totient is φ = 7687296.

The previous prime is 22421837. The next prime is 22421857. The reversal of 22421840 is 4812422.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19460 + ... + 20579.

It is an arithmetic number, because the mean of its divisors is an integer number (1489488).

Almost surely, 2^22421840 is an apocalyptic number.

22421840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22421840 is an abundant number, since it is smaller than the sum of its proper divisors (37157680).

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

22421840 is a wasteful number, since it uses less digits than its factorization.

22421840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40059 (or 40053 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 22421840 is about 4735.1705354718. The cubic root of 22421840 is about 281.9835344074.

The spelling of 22421840 in words is "twenty-two million, four hundred twenty-one thousand, eight hundred forty".