2790805 has 8 divisors (see below), whose sum is σ = 3546072. Its totient is φ = 2101248.

The previous prime is 2790779. The next prime is 2790841. The reversal of 2790805 is 5080972.

2790805 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 743044 + 2047761 = 862^2 + 1431^2 .

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 2790805 - 2¹³ = 2782613 is a prime.

It is a Duffinian number.

2790805 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 16332 + ... + 16501.

It is an arithmetic number, because the mean of its divisors is an integer number (443259).

2^2790805 is an apocalyptic number.

It is an amenable number.

2790805 is a deficient number, since it is larger than the sum of its proper divisors (755267).

2790805 is a wasteful number, since it uses less digits than its factorization.

2790805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32855.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2790805 is about 1670.5702619166. The cubic root of 2790805 is about 140.7915199406.

The spelling of 2790805 in words is "two million, seven hundred ninety thousand, eight hundred five".