123839 has 4 divisors (see below), whose sum is σ = 127224. Its totient is φ = 120456.

The previous prime is 123833. The next prime is 123853. The reversal of 123839 is 938321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938321 = 521 ⋅1801.

It is a cyclic number.

It is not a de Polignac number, because 123839 - 2⁸ = 123583 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 (123833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637 + ... + 1710.

It is an arithmetic number, because the mean of its divisors is an integer number (31806).

2¹²³⁸³⁹ is an apocalyptic number.

123839 is a deficient number, since it is larger than the sum of its proper divisors (3385).

123839 is an equidigital number, since it uses as much as digits as its factorization.

123839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384.

The product of its digits is 1296, while the sum is 26.

The square root of 123839 is about 351.9076583424. The cubic root of 123839 is about 49.8447182508.

The spelling of 123839 in words is "one hundred twenty-three thousand, eight hundred thirty-nine".