2172845 has 8 divisors (see below), whose sum is σ = 2643576. Its totient is φ = 1714176.

The previous prime is 2172839. The next prime is 2172847. The reversal of 2172845 is 5482712.

2172845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 169 + 2172676 = 13^2 + 1474^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2172845 - 2⁴ = 2172829 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 (2172847) 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 7 ways as a sum of consecutive naturals, for example, 2612 + ... + 3341.

It is an arithmetic number, because the mean of its divisors is an integer number (330447).

2^2172845 is an apocalyptic number.

It is an amenable number.

2172845 is a deficient number, since it is larger than the sum of its proper divisors (470731).

2172845 is an equidigital number, since it uses as much as digits as its factorization.

2172845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6031.

The product of its digits is 4480, while the sum is 29.

The square root of 2172845 is about 1474.0573258866. The cubic root of 2172845 is about 129.5218132334.

The spelling of 2172845 in words is "two million, one hundred seventy-two thousand, eight hundred forty-five".