22172730 has 32 divisors (see below), whose sum is σ = 53524800. Its totient is φ = 5878272.

The previous prime is 22172729. The next prime is 22172737. The reversal of 22172730 is 3727122.

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 22172730.

It is not an unprimeable number, because it can be changed into a prime (22172737) 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 15 ways as a sum of consecutive naturals, for example, 3306 + ... + 7434.

It is an arithmetic number, because the mean of its divisors is an integer number (1672650).

Almost surely, 2^22172730 is an apocalyptic number.

22172730 is an abundant number, since it is smaller than the sum of its proper divisors (31352070).

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

22172730 is a wasteful number, since it uses less digits than its factorization.

22172730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 22172730 is about 4708.7928389344. The cubic root of 22172730 is about 280.9353498429.

Adding to 22172730 its reverse (3727122), we get a palindrome (25899852).

The spelling of 22172730 in words is "twenty-two million, one hundred seventy-two thousand, seven hundred thirty".