2180305 has 4 divisors (see below), whose sum is σ = 2616372. Its totient is φ = 1744240.

The previous prime is 2180303. The next prime is 2180329. The reversal of 2180305 is 5030812.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1016064 + 1164241 = 1008^2 + 1079^2 .

It is not a de Polignac number, because 2180305 - 2¹ = 2180303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2180303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218026 + ... + 218035.

It is an arithmetic number, because the mean of its divisors is an integer number (654093).

2^2180305 is an apocalyptic number.

It is an amenable number.

2180305 is a deficient number, since it is larger than the sum of its proper divisors (436067).

2180305 is an equidigital number, since it uses as much as digits as its factorization.

2180305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436066.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2180305 is about 1476.5855884438. The cubic root of 2180305 is about 129.6698724287.

It can be divided in two parts, 2180 and 305, that added together give a triangular number (2485 = T₇₀).

The spelling of 2180305 in words is "two million, one hundred eighty thousand, three hundred five".