2199806 has 12 divisors (see below), whose sum is σ = 3838608. Its totient is φ = 942732.

The previous prime is 2199803. The next prime is 2199823. The reversal of 2199806 is 6089912.

2199806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2199803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11126 + ... + 11321.

It is an arithmetic number, because the mean of its divisors is an integer number (319884).

2^2199806 is an apocalyptic number.

2199806 is a deficient number, since it is larger than the sum of its proper divisors (1638802).

2199806 is a wasteful number, since it uses less digits than its factorization.

2199806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22463 (or 22456 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 2199806 is about 1483.1742985907. The cubic root of 2199806 is about 130.0553216221.

The spelling of 2199806 in words is "two million, one hundred ninety-nine thousand, eight hundred six".