2909839 has 4 divisors (see below), whose sum is σ = 3081024. Its totient is φ = 2738656.

The previous prime is 2909833. The next prime is 2909849. The reversal of 2909839 is 9389092.

It is a happy number.

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-2909839 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 (2909833) 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, 85567 + ... + 85600.

It is an arithmetic number, because the mean of its divisors is an integer number (770256).

2^2909839 is an apocalyptic number.

2909839 is a deficient number, since it is larger than the sum of its proper divisors (171185).

2909839 is a wasteful number, since it uses less digits than its factorization.

2909839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171184.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 2909839 is about 1705.8250203347. The cubic root of 2909839 is about 142.7654066753.

The spelling of 2909839 in words is "two million, nine hundred nine thousand, eight hundred thirty-nine".