2078305 has 4 divisors (see below), whose sum is σ = 2493972. Its totient is φ = 1662640.

The previous prime is 2078287. The next prime is 2078309. The reversal of 2078305 is 5038702.

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 314721 + 1763584 = 561^2 + 1328^2 .

It is not a de Polignac number, because 2078305 - 2⁷ = 2078177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2078305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207826 + ... + 207835.

It is an arithmetic number, because the mean of its divisors is an integer number (623493).

2^2078305 is an apocalyptic number.

It is an amenable number.

2078305 is a deficient number, since it is larger than the sum of its proper divisors (415667).

2078305 is an equidigital number, since it uses as much as digits as its factorization.

2078305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415666.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 2078305 is about 1441.6327548998. The cubic root of 2078305 is about 127.6154023722.

The spelling of 2078305 in words is "two million, seventy-eight thousand, three hundred five".