2806609 has 4 divisors (see below), whose sum is σ = 3022516. Its totient is φ = 2590704.

The previous prime is 2806607. The next prime is 2806613. The reversal of 2806609 is 9066082.

2806609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9066082 = 2 ⋅4533041.

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 2259009 = 740^2 + 1503^2 .

It is a cyclic number.

It is not a de Polignac number, because 2806609 - 2¹ = 2806607 is a prime.

It is a Duffinian number.

2806609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2806603) 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 3 ways as a sum of consecutive naturals, for example, 107934 + ... + 107959.

It is an arithmetic number, because the mean of its divisors is an integer number (755629).

2^2806609 is an apocalyptic number.

It is an amenable number.

2806609 is a deficient number, since it is larger than the sum of its proper divisors (215907).

2806609 is a wasteful number, since it uses less digits than its factorization.

2806609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215906.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2806609 is about 1675.2937055931. The cubic root of 2806609 is about 141.0567817848.

It can be divided in two parts, 280 and 6609, that added together give a square (6889 = 83²).

The spelling of 2806609 in words is "two million, eight hundred six thousand, six hundred nine".