2161206 has 12 divisors (see below), whose sum is σ = 4682652. Its totient is φ = 720396.

The previous prime is 2161199. The next prime is 2161213. The reversal of 2161206 is 6021612.

It is a happy number.

2161206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2161199) and next prime (2161213).

It is a super-2 number, since 2×2161206² = 9341622748872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 120067 = 2161206 / (2 + 1 + 6 + 1 + 2 + 0 + 6).

It is a congruent number.

It is an unprimeable number.

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, 60016 + ... + 60051.

It is an arithmetic number, because the mean of its divisors is an integer number (390221).

2^2161206 is an apocalyptic number.

2161206 is an abundant number, since it is smaller than the sum of its proper divisors (2521446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161206 is a wasteful number, since it uses less digits than its factorization.

2161206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120075 (or 120072 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2161206 is about 1470.1040779482. The cubic root of 2161206 is about 129.2901347799.

Adding to 2161206 its reverse (6021612), we get a palindrome (8182818).

The spelling of 2161206 in words is "two million, one hundred sixty-one thousand, two hundred six".