1243839 has 16 divisors (see below), whose sum is σ = 1818720. Its totient is φ = 753536.

The previous prime is 1243819. The next prime is 1243841. The reversal of 1243839 is 9383421.

It is not a de Polignac number, because 1243839 - 2⁵ = 1243807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42877 + ... + 42905.

It is an arithmetic number, because the mean of its divisors is an integer number (113670).

2^1243839 is an apocalyptic number.

1243839 is a deficient number, since it is larger than the sum of its proper divisors (574881).

1243839 is an frugal number, since it uses more digits than its factorization.

1243839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 49 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 1243839 is about 1115.2753023357. The cubic root of 1243839 is about 107.5444633087.

The spelling of 1243839 in words is "one million, two hundred forty-three thousand, eight hundred thirty-nine".