2159805 has 16 divisors (see below), whose sum is σ = 3484224. Its totient is φ = 1142400.

The previous prime is 2159789. The next prime is 2159809. The reversal of 2159805 is 5089512.

It is not a de Polignac number, because 2159805 - 2⁴ = 2159789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159809) 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, 1530 + ... + 2580.

It is an arithmetic number, because the mean of its divisors is an integer number (217764).

2^2159805 is an apocalyptic number.

It is an amenable number.

2159805 is a deficient number, since it is larger than the sum of its proper divisors (1324419).

2159805 is a wasteful number, since it uses less digits than its factorization.

2159805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 2159805 is about 1469.6275038254. The cubic root of 2159805 is about 129.2621913333.

The spelling of 2159805 in words is "two million, one hundred fifty-nine thousand, eight hundred five".