2189689 has 4 divisors (see below), whose sum is σ = 2240656. Its totient is φ = 2138724.

The previous prime is 2189647. The next prime is 2189699. The reversal of 2189689 is 9869812.

It is a happy number.

2189689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2189689 - 2⁹ = 2189177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 50923 = 2189689 / (2 + 1 + 8 + 9 + 6 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25419 + ... + 25504.

It is an arithmetic number, because the mean of its divisors is an integer number (560164).

2^2189689 is an apocalyptic number.

It is an amenable number.

2189689 is a deficient number, since it is larger than the sum of its proper divisors (50967).

2189689 is an equidigital number, since it uses as much as digits as its factorization.

2189689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50966.

The product of its digits is 62208, while the sum is 43.

The square root of 2189689 is about 1479.7597778018. The cubic root of 2189689 is about 129.8556385665.

The spelling of 2189689 in words is "two million, one hundred eighty-nine thousand, six hundred eighty-nine".