2805139 has 4 divisors (see below), whose sum is σ = 2844720. Its totient is φ = 2765560.

The previous prime is 2805137. The next prime is 2805157. The reversal of 2805139 is 9315082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2805139 - 2¹ = 2805137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2805137) 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, 19684 + ... + 19825.

It is an arithmetic number, because the mean of its divisors is an integer number (711180).

2^2805139 is an apocalyptic number.

2805139 is a deficient number, since it is larger than the sum of its proper divisors (39581).

2805139 is an equidigital number, since it uses as much as digits as its factorization.

2805139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39580.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2805139 is about 1674.8549190900. The cubic root of 2805139 is about 141.0321506753.

The spelling of 2805139 in words is "two million, eight hundred five thousand, one hundred thirty-nine".