22231724 has 6 divisors (see below), whose sum is σ = 38905524. Its totient is φ = 11115860.

The previous prime is 22231723. The next prime is 22231757. The reversal of 22231724 is 42713222.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22231724.

It is not an unprimeable number, because it can be changed into a prime (22231723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2778962 + ... + 2778969.

It is an arithmetic number, because the mean of its divisors is an integer number (6484254).

Almost surely, 2^22231724 is an apocalyptic number.

It is an amenable number.

22231724 is a deficient number, since it is larger than the sum of its proper divisors (16673800).

22231724 is a wasteful number, since it uses less digits than its factorization.

22231724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557935 (or 5557933 counting only the distinct ones).

The product of its digits is 1344, while the sum is 23.

The square root of 22231724 is about 4715.0529159279. The cubic root of 22231724 is about 281.1842866063.

Adding to 22231724 its reverse (42713222), we get a palindrome (64944946).

The spelling of 22231724 in words is "twenty-two million, two hundred thirty-one thousand, seven hundred twenty-four".