109839 has 16 divisors (see below), whose sum is σ = 161280. Its totient is φ = 66240.

The previous prime is 109831. The next prime is 109841. The reversal of 109839 is 938901.

It is a happy number.

It is not a de Polignac number, because 109839 - 2³ = 109831 is a prime.

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 109839.

It is not an unprimeable number, because it can be changed into a prime (109831) 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, 2314 + ... + 2360.

It is an arithmetic number, because the mean of its divisors is an integer number (10080).

2¹⁰⁹⁸³⁹ is an apocalyptic number.

109839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

109839 is a deficient number, since it is larger than the sum of its proper divisors (51441).

109839 is a wasteful number, since it uses less digits than its factorization.

109839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 109839 is about 331.4196735259. The cubic root of 109839 is about 47.8908108354.

The spelling of 109839 in words is "one hundred nine thousand, eight hundred thirty-nine".