2173205 has 8 divisors (see below), whose sum is σ = 2671704. Its totient is φ = 1696000.

The previous prime is 2173183. The next prime is 2173207. The reversal of 2173205 is 5023712.

It can be written as a sum of positive squares in 4 ways, for example, as 119716 + 2053489 = 346^2 + 1433^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2173205 - 2⁶ = 2173141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5096 + ... + 5505.

It is an arithmetic number, because the mean of its divisors is an integer number (333963).

2^2173205 is an apocalyptic number.

It is an amenable number.

2173205 is a deficient number, since it is larger than the sum of its proper divisors (498499).

2173205 is a wasteful number, since it uses less digits than its factorization.

2173205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10647.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 2173205 is about 1474.1794327693. The cubic root of 2173205 is about 129.5289659569.

Adding to 2173205 its reverse (5023712), we get a palindrome (7196917).

The spelling of 2173205 in words is "two million, one hundred seventy-three thousand, two hundred five".