22505989 has 4 divisors (see below), whose sum is σ = 24552000. Its totient is φ = 20459980.

The previous prime is 22505947. The next prime is 22506017. The reversal of 22505989 is 98950522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22505989 - 2¹¹ = 22503941 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22505929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1022989 + ... + 1023010.

It is an arithmetic number, because the mean of its divisors is an integer number (6138000).

Almost surely, 2^22505989 is an apocalyptic number.

It is an amenable number.

22505989 is a deficient number, since it is larger than the sum of its proper divisors (2046011).

22505989 is a wasteful number, since it uses less digits than its factorization.

22505989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046010.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 22505989 is about 4744.0477442791. The cubic root of 22505989 is about 282.3358547301.

The spelling of 22505989 in words is "twenty-two million, five hundred five thousand, nine hundred eighty-nine".