2189861 has 8 divisors (see below), whose sum is σ = 2264064. Its totient is φ = 2116800.

The previous prime is 2189843. The next prime is 2189867. The reversal of 2189861 is 1689812.

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 2189861 - 2⁶ = 2189797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5261 + ... + 5661.

It is an arithmetic number, because the mean of its divisors is an integer number (283008).

2^2189861 is an apocalyptic number.

It is an amenable number.

2189861 is a deficient number, since it is larger than the sum of its proper divisors (74203).

2189861 is a wasteful number, since it uses less digits than its factorization.

2189861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571.

The product of its digits is 6912, while the sum is 35.

The square root of 2189861 is about 1479.8178942019. The cubic root of 2189861 is about 129.8590385295.

The spelling of 2189861 in words is "two million, one hundred eighty-nine thousand, eight hundred sixty-one".