1231839 has 12 divisors (see below), whose sum is σ = 2033616. Its totient is φ = 703872.

The previous prime is 1231831. The next prime is 1231843. The reversal of 1231839 is 9381321.

It is not a de Polignac number, because 1231839 - 2³ = 1231831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9714 + ... + 9839.

It is an arithmetic number, because the mean of its divisors is an integer number (169468).

2^1231839 is an apocalyptic number.

1231839 is a deficient number, since it is larger than the sum of its proper divisors (801777).

1231839 is a wasteful number, since it uses less digits than its factorization.

1231839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19566 (or 19563 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1231839 is about 1109.8824262056. The cubic root of 1231839 is about 107.1974982245.

The spelling of 1231839 in words is "one million, two hundred thirty-one thousand, eight hundred thirty-nine".