2172206 has 4 divisors (see below), whose sum is σ = 3258312. Its totient is φ = 1086102.

The previous prime is 2172197. The next prime is 2172211. The reversal of 2172206 is 6022712.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543050 + ... + 543053.

It is an arithmetic number, because the mean of its divisors is an integer number (814578).

2^2172206 is an apocalyptic number.

2172206 is a deficient number, since it is larger than the sum of its proper divisors (1086106).

2172206 is a wasteful number, since it uses less digits than its factorization.

2172206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086105.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 2172206 is about 1473.8405612548. The cubic root of 2172206 is about 129.5091152034.

Adding to 2172206 its reverse (6022712), we get a palindrome (8194918).

It can be divided in two parts, 21 and 72206, that added together give a palindrome (72227).

The spelling of 2172206 in words is "two million, one hundred seventy-two thousand, two hundred six".