2305139 has 4 divisors (see below), whose sum is σ = 2311920. Its totient is φ = 2298360.

The previous prime is 2305133. The next prime is 2305153. The reversal of 2305139 is 9315032.

It is a happy number.

2305139 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2305139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2305133) 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, 2852 + ... + 3569.

It is an arithmetic number, because the mean of its divisors is an integer number (577980).

2^2305139 is an apocalyptic number.

2305139 is a deficient number, since it is larger than the sum of its proper divisors (6781).

2305139 is an equidigital number, since it uses as much as digits as its factorization.

2305139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 2305139 is about 1518.2684215909. The cubic root of 2305139 is about 132.0988508097.

The spelling of 2305139 in words is "two million, three hundred five thousand, one hundred thirty-nine".