22001689 has 8 divisors (see below), whose sum is σ = 23616360. Its totient is φ = 20422656.

The previous prime is 22001669. The next prime is 22001699. The reversal of 22001689 is 98610022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8311689 + 13690000 = 2883^2 + 3700^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22001689 - 2⁵ = 22001657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22001659) 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 7 ways as a sum of consecutive naturals, for example, 7624 + ... + 10105.

It is an arithmetic number, because the mean of its divisors is an integer number (2952045).

Almost surely, 2^22001689 is an apocalyptic number.

It is an amenable number.

22001689 is a deficient number, since it is larger than the sum of its proper divisors (1614671).

22001689 is a wasteful number, since it uses less digits than its factorization.

22001689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17819.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 22001689 is about 4690.5958043728. The cubic root of 22001689 is about 280.2111035554.

Subtracting from 22001689 its sum of digits (28), we obtain a triangular number (22001661 = T₆₆₃₃).

The spelling of 22001689 in words is "twenty-two million, one thousand, six hundred eighty-nine".