1311839 has 4 divisors (see below), whose sum is σ = 1389024. Its totient is φ = 1234656.

The previous prime is 1311829. The next prime is 1311847. The reversal of 1311839 is 9381131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9381131 = 1039 ⋅9029.

It is a cyclic number.

It is not a de Polignac number, because 1311839 - 2¹⁶ = 1246303 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 (1311829) 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, 38567 + ... + 38600.

It is an arithmetic number, because the mean of its divisors is an integer number (347256).

2^1311839 is an apocalyptic number.

1311839 is a deficient number, since it is larger than the sum of its proper divisors (77185).

1311839 is an equidigital number, since it uses as much as digits as its factorization.

1311839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77184.

The product of its digits is 648, while the sum is 26.

The square root of 1311839 is about 1145.3554033574. The cubic root of 1311839 is about 109.4695953337.

The spelling of 1311839 in words is "one million, three hundred eleven thousand, eight hundred thirty-nine".