311839 has 4 divisors (see below), whose sum is σ = 340200. Its totient is φ = 283480.

The previous prime is 311827. The next prime is 311867. The reversal of 311839 is 938113.

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 311839 - 2⁵ = 311807 is a prime.

It is a Duffinian number.

311839 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311869) 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, 14164 + ... + 14185.

It is an arithmetic number, because the mean of its divisors is an integer number (85050).

2³¹¹⁸³⁹ is an apocalyptic number.

311839 is a deficient number, since it is larger than the sum of its proper divisors (28361).

311839 is a wasteful number, since it uses less digits than its factorization.

311839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28360.

The product of its digits is 648, while the sum is 25.

The square root of 311839 is about 558.4254650354. The cubic root of 311839 is about 67.8125605059.

The spelling of 311839 in words is "three hundred eleven thousand, eight hundred thirty-nine".