2809879 has 4 divisors (see below), whose sum is σ = 2975184. Its totient is φ = 2644576.

The previous prime is 2809867. The next prime is 2809883. The reversal of 2809879 is 9789082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9789082 = 2 ⋅4894541.

It is a cyclic number.

It is not a de Polignac number, because 2809879 - 2⁵ = 2809847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82627 + ... + 82660.

It is an arithmetic number, because the mean of its divisors is an integer number (743796).

2^2809879 is an apocalyptic number.

2809879 is a deficient number, since it is larger than the sum of its proper divisors (165305).

2809879 is a wasteful number, since it uses less digits than its factorization.

2809879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165304.

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

The square root of 2809879 is about 1676.2693697613. The cubic root of 2809879 is about 141.1115426077. Note that the first 3 decimals are identical.

The spelling of 2809879 in words is "two million, eight hundred nine thousand, eight hundred seventy-nine".