2189805 has 8 divisors (see below), whose sum is σ = 3503712. Its totient is φ = 1167888.

The previous prime is 2189797. The next prime is 2189813. The reversal of 2189805 is 5089812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2189797) and next prime (2189813).

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

It is not a de Polignac number, because 2189805 - 2³ = 2189797 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72979 + ... + 73008.

It is an arithmetic number, because the mean of its divisors is an integer number (437964).

2^2189805 is an apocalyptic number.

It is an amenable number.

2189805 is a deficient number, since it is larger than the sum of its proper divisors (1313907).

2189805 is a wasteful number, since it uses less digits than its factorization.

2189805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145995.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 2189805 is about 1479.7989728338. The cubic root of 2189805 is about 129.8579315844.

The spelling of 2189805 in words is "two million, one hundred eighty-nine thousand, eight hundred five".