22278129 has 8 divisors (see below), whose sum is σ = 30428832. Its totient is φ = 14489760.

The previous prime is 22278121. The next prime is 22278131. The reversal of 22278129 is 92187222.

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

It is not a de Polignac number, because 22278129 - 2³ = 22278121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22278129.

It is not an unprimeable number, because it can be changed into a prime (22278121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90439 + ... + 90684.

It is an arithmetic number, because the mean of its divisors is an integer number (3803604).

Almost surely, 2^22278129 is an apocalyptic number.

It is an amenable number.

22278129 is a deficient number, since it is larger than the sum of its proper divisors (8150703).

22278129 is a wasteful number, since it uses less digits than its factorization.

22278129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181167.

The product of its digits is 8064, while the sum is 33.

The square root of 22278129 is about 4719.9712922856. The cubic root of 22278129 is about 281.3797923406.

The spelling of 22278129 in words is "twenty-two million, two hundred seventy-eight thousand, one hundred twenty-nine".