22128009 has 8 divisors (see below), whose sum is σ = 30004320. Its totient is φ = 14501856.

The previous prime is 22127947. The next prime is 22128011. The reversal of 22128009 is 90082122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22128009 - 2⁷ = 22127881 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22128009.

It is not an unprimeable number, because it can be changed into a prime (22128019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62332 + ... + 62685.

It is an arithmetic number, because the mean of its divisors is an integer number (3750540).

Almost surely, 2^22128009 is an apocalyptic number.

It is an amenable number.

22128009 is a deficient number, since it is larger than the sum of its proper divisors (7876311).

22128009 is a wasteful number, since it uses less digits than its factorization.

22128009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125079.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 22128009 is about 4704.0417727737. The cubic root of 22128009 is about 280.7463464140.

The spelling of 22128009 in words is "twenty-two million, one hundred twenty-eight thousand, nine".