2642809 has 4 divisors (see below), whose sum is σ = 2846116. Its totient is φ = 2439504.

The previous prime is 2642797. The next prime is 2642821. The reversal of 2642809 is 9082462.

2642809 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.

It is an interprime number because it is at equal distance from previous prime (2642797) and next prime (2642821).

It can be written as a sum of positive squares in 2 ways, for example, as 1210000 + 1432809 = 1100^2 + 1197^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642809 - 2⁵ = 2642777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2642839) 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, 101634 + ... + 101659.

It is an arithmetic number, because the mean of its divisors is an integer number (711529).

2^2642809 is an apocalyptic number.

It is an amenable number.

2642809 is a deficient number, since it is larger than the sum of its proper divisors (203307).

2642809 is a wasteful number, since it uses less digits than its factorization.

2642809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203306.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 2642809 is about 1625.6718611085. The cubic root of 2642809 is about 138.2574658584.

The spelling of 2642809 in words is "two million, six hundred forty-two thousand, eight hundred nine".