100839 has 4 divisors (see below), whose sum is σ = 134456. Its totient is φ = 67224.

The previous prime is 100829. The next prime is 100847. The reversal of 100839 is 938001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 100839 - 2⁴ = 100823 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100829) 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, 16804 + ... + 16809.

It is an arithmetic number, because the mean of its divisors is an integer number (33614).

2¹⁰⁰⁸³⁹ is an apocalyptic number.

100839 is a deficient number, since it is larger than the sum of its proper divisors (33617).

100839 is an equidigital number, since it uses as much as digits as its factorization.

100839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33616.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 100839 is about 317.5515706149. The cubic root of 100839 is about 46.5453367519.

It can be divided in two parts, 100 and 839, that added together give a palindrome (939).

The spelling of 100839 in words is "one hundred thousand, eight hundred thirty-nine".