2165206 has 4 divisors (see below), whose sum is σ = 3247812. Its totient is φ = 1082602.

The previous prime is 2165201. The next prime is 2165213. The reversal of 2165206 is 6025612.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541300 + ... + 541303.

It is an arithmetic number, because the mean of its divisors is an integer number (811953).

2^2165206 is an apocalyptic number.

2165206 is a deficient number, since it is larger than the sum of its proper divisors (1082606).

2165206 is a wasteful number, since it uses less digits than its factorization.

2165206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082605.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2165206 is about 1471.4638969407. The cubic root of 2165206 is about 129.3698498109.

The spelling of 2165206 in words is "two million, one hundred sixty-five thousand, two hundred six".