122439 has 4 divisors (see below), whose sum is σ = 163256. Its totient is φ = 81624.

The previous prime is 122401. The next prime is 122443. The reversal of 122439 is 934221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934221 = 3 ⋅311407.

It is not a de Polignac number, because 122439 - 2¹¹ = 120391 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 (122449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20404 + ... + 20409.

It is an arithmetic number, because the mean of its divisors is an integer number (40814).

2¹²²⁴³⁹ is an apocalyptic number.

122439 is a deficient number, since it is larger than the sum of its proper divisors (40817).

122439 is an equidigital number, since it uses as much as digits as its factorization.

122439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40816.

The product of its digits is 432, while the sum is 21.

The square root of 122439 is about 349.9128462918. The cubic root of 122439 is about 49.6561744323.

It can be divided in two parts, 122 and 439, that added together give a triangular number (561 = T₃₃).

The spelling of 122439 in words is "one hundred twenty-two thousand, four hundred thirty-nine".