2109439 has 4 divisors (see below), whose sum is σ = 2114424. Its totient is φ = 2104456.

The previous prime is 2109421. The next prime is 2109449. The reversal of 2109439 is 9349012.

It is a happy number.

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 2109439 - 2⁷ = 2109311 is a prime.

It is a Duffinian number.

2109439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109449) 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, 1792 + ... + 2725.

It is an arithmetic number, because the mean of its divisors is an integer number (528606).

2^2109439 is an apocalyptic number.

2109439 is a deficient number, since it is larger than the sum of its proper divisors (4985).

2109439 is an equidigital number, since it uses as much as digits as its factorization.

2109439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4984.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 2109439 is about 1452.3907876326. The cubic root of 2109439 is about 128.2494930361.

The spelling of 2109439 in words is "two million, one hundred nine thousand, four hundred thirty-nine".