22721589 has 24 divisors (see below), whose sum is σ = 36777312. Its totient is φ = 13396320.

The previous prime is 22721581. The next prime is 22721591. The reversal of 22721589 is 98512722.

22721589 is a `hidden beast` number, since 2 + 2 + 72 + 1 + 589 = 666.

It is not a de Polignac number, because 22721589 - 2³ = 22721581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22721581) 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 in 23 ways as a sum of consecutive naturals, for example, 562 + ... + 6764.

It is an arithmetic number, because the mean of its divisors is an integer number (1532388).

Almost surely, 2^22721589 is an apocalyptic number.

It is an amenable number.

22721589 is a deficient number, since it is larger than the sum of its proper divisors (14055723).

22721589 is a wasteful number, since it uses less digits than its factorization.

22721589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257 (or 6254 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 22721589 is about 4766.7167946082. The cubic root of 22721589 is about 283.2345527242.

The spelling of 22721589 in words is "twenty-two million, seven hundred twenty-one thousand, five hundred eighty-nine".