2309839 has 4 divisors (see below), whose sum is σ = 2639824. Its totient is φ = 1979856.

The previous prime is 2309837. The next prime is 2309863. The reversal of 2309839 is 9389032.

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 2309839 - 2¹ = 2309837 is a prime.

It is an Ulam number.

It is a Duffinian number.

2309839 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2309837) 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, 164982 + ... + 164995.

It is an arithmetic number, because the mean of its divisors is an integer number (659956).

2^2309839 is an apocalyptic number.

2309839 is a deficient number, since it is larger than the sum of its proper divisors (329985).

2309839 is an equidigital number, since it uses as much as digits as its factorization.

2309839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329984.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 2309839 is about 1519.8154493227. The cubic root of 2309839 is about 132.1885696382.

The spelling of 2309839 in words is "two million, three hundred nine thousand, eight hundred thirty-nine".