172439 has 2 divisors, whose sum is σ = 172440. Its totient is φ = 172438.

The previous prime is 172433. The next prime is 172441. The reversal of 172439 is 934271.

172439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172439 - 2⁴ = 172423 is a prime.

Together with 172441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86219 + 86220.

It is an arithmetic number, because the mean of its divisors is an integer number (86220).

2¹⁷²⁴³⁹ is an apocalyptic number.

172439 is a deficient number, since it is larger than the sum of its proper divisors (1).

172439 is an equidigital number, since it uses as much as digits as its factorization.

172439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 26.

The square root of 172439 is about 415.2577512823. The cubic root of 172439 is about 55.6602516103.

The spelling of 172439 in words is "one hundred seventy-two thousand, four hundred thirty-nine".