1909439 has 4 divisors (see below), whose sum is σ = 2182224. Its totient is φ = 1636656.

The previous prime is 1909429. The next prime is 1909441. The reversal of 1909439 is 9349091.

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

It is not a de Polignac number, because 1909439 - 2⁸ = 1909183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1909399 and 1909408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136382 + ... + 136395.

It is an arithmetic number, because the mean of its divisors is an integer number (545556).

2^1909439 is an apocalyptic number.

1909439 is a deficient number, since it is larger than the sum of its proper divisors (272785).

1909439 is an equidigital number, since it uses as much as digits as its factorization.

1909439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272784.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1909439 is about 1381.8245185261. The cubic root of 1909439 is about 124.0609958323.

The spelling of 1909439 in words is "one million, nine hundred nine thousand, four hundred thirty-nine".