2805839 has 4 divisors (see below), whose sum is σ = 2927856. Its totient is φ = 2683824.

The previous prime is 2805827. The next prime is 2805851. The reversal of 2805839 is 9385082.

2805839 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 (2805827) and next prime (2805851).

It is a de Polignac number, because none of the positive numbers 2^k-2805839 is a prime.

It is a d-powerful number, because it can be written as 2⁴ + 8² + 0 + 5⁹ + 8⁶ + 3¹² + 9⁵ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2805799 and 2805808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805809) 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, 60974 + ... + 61019.

It is an arithmetic number, because the mean of its divisors is an integer number (731964).

2^2805839 is an apocalyptic number.

2805839 is a deficient number, since it is larger than the sum of its proper divisors (122017).

2805839 is a wasteful number, since it uses less digits than its factorization.

2805839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122016.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 2805839 is about 1675.0638793789. The cubic root of 2805839 is about 141.0438808480.

The spelling of 2805839 in words is "two million, eight hundred five thousand, eight hundred thirty-nine".