2879809 has 3 divisors (see below), whose sum is σ = 2881507. Its totient is φ = 2878112.

The previous prime is 2879803. The next prime is 2879819. The reversal of 2879809 is 9089782.

The square root of 2879809 is 1697.

It is a perfect power (a square), and thus also a powerful number.

2879809 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 a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2772225 + 107584 = 1665^2 + 328^2 .

It is not a de Polignac number, because 2879809 - 2³ = 2879801 is a prime.

It is a Duffinian number.

2879809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2879801) 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 2 ways as a sum of consecutive naturals, for example, 849 + ... + 2545.

2^2879809 is an apocalyptic number.

2879809 is the 1697-th square number.

2879809 is the 849-th centered octagonal number.

It is an amenable number.

2879809 is a deficient number, since it is larger than the sum of its proper divisors (1698).

2879809 is an frugal number, since it uses more digits than its factorization.

2879809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The cubic root of 2879809 is about 142.2725868942.

The spelling of 2879809 in words is "two million, eight hundred seventy-nine thousand, eight hundred nine".