981839 has 4 divisors (see below), whose sum is σ = 983856. Its totient is φ = 979824.

The previous prime is 981823. The next prime is 981887. The reversal of 981839 is 938189.

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 981839 - 2⁴ = 981823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981839.

It is not an unprimeable number, because it can be changed into a prime (981809) 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, 227 + ... + 1419.

It is an arithmetic number, because the mean of its divisors is an integer number (245964).

2⁹⁸¹⁸³⁹ is an apocalyptic number.

981839 is a deficient number, since it is larger than the sum of its proper divisors (2017).

981839 is a wasteful number, since it uses less digits than its factorization.

981839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016.

The product of its digits is 15552, while the sum is 38.

The square root of 981839 is about 990.8778935873. The cubic root of 981839 is about 99.3909312169.

The spelling of 981839 in words is "nine hundred eighty-one thousand, eight hundred thirty-nine".