22142809 has 16 divisors (see below), whose sum is σ = 25305280. Its totient is φ = 19206720.

The previous prime is 22142803. The next prime is 22142833. The reversal of 22142809 is 90824122.

It is not a de Polignac number, because 22142809 - 2⁹ = 22142297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22142803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38494 + ... + 39064.

It is an arithmetic number, because the mean of its divisors is an integer number (1581580).

Almost surely, 2^22142809 is an apocalyptic number.

It is an amenable number.

22142809 is a deficient number, since it is larger than the sum of its proper divisors (3162471).

22142809 is a wasteful number, since it uses less digits than its factorization.

22142809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 22142809 is about 4705.6146251048. The cubic root of 22142809 is about 280.8089235144.

It can be divided in two parts, 2214 and 2809, that multiplied together give a palindrome (6219126).

The spelling of 22142809 in words is "twenty-two million, one hundred forty-two thousand, eight hundred nine".