22528389 has 16 divisors (see below), whose sum is σ = 33465600. Its totient is φ = 13384896.

The previous prime is 22528367. The next prime is 22528391. The reversal of 22528389 is 98382522.

It is not a de Polignac number, because 22528389 - 2²¹ = 20431237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22528309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8829 + ... + 11090.

It is an arithmetic number, because the mean of its divisors is an integer number (2091600).

Almost surely, 2^22528389 is an apocalyptic number.

22528389 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

22528389 is a deficient number, since it is larger than the sum of its proper divisors (10937211).

22528389 is a wasteful number, since it uses less digits than its factorization.

22528389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19964.

The product of its digits is 69120, while the sum is 39.

The square root of 22528389 is about 4746.4080102747. The cubic root of 22528389 is about 282.4294924151.

The spelling of 22528389 in words is "twenty-two million, five hundred twenty-eight thousand, three hundred eighty-nine".