22209723 has 12 divisors (see below), whose sum is σ = 32533488. Its totient is φ = 14597520.

The previous prime is 22209713. The next prime is 22209749. The reversal of 22209723 is 32790222.

It is not a de Polignac number, because 22209723 - 2⁹ = 22209211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22209713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16740 + ... + 18017.

It is an arithmetic number, because the mean of its divisors is an integer number (2711124).

Almost surely, 2^22209723 is an apocalyptic number.

22209723 is a deficient number, since it is larger than the sum of its proper divisors (10323765).

22209723 is a wasteful number, since it uses less digits than its factorization.

22209723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34834 (or 34831 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 22209723 is about 4712.7192787180. The cubic root of 22209723 is about 281.0915006198.

Adding to 22209723 its reverse (32790222), we get a palindrome (54999945).

The spelling of 22209723 in words is "twenty-two million, two hundred nine thousand, seven hundred twenty-three".