2189605 has 16 divisors (see below), whose sum is σ = 2939328. Its totient is φ = 1552000.

The previous prime is 2189599. The next prime is 2189609. The reversal of 2189605 is 5069812.

It is not a de Polignac number, because 2189605 - 2⁵ = 2189573 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189609) 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, 1770 + ... + 2740.

It is an arithmetic number, because the mean of its divisors is an integer number (183708).

2^2189605 is an apocalyptic number.

It is an amenable number.

2189605 is a deficient number, since it is larger than the sum of its proper divisors (749723).

2189605 is a wasteful number, since it uses less digits than its factorization.

2189605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2189605 is about 1479.7313945443. The cubic root of 2189605 is about 129.8539780547.

The spelling of 2189605 in words is "two million, one hundred eighty-nine thousand, six hundred five".