173639 has 4 divisors (see below), whose sum is σ = 175680. Its totient is φ = 171600.

The previous prime is 173629. The next prime is 173647. The reversal of 173639 is 936371.

173639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-173639 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173629) 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, 887 + ... + 1064.

It is an arithmetic number, because the mean of its divisors is an integer number (43920).

2¹⁷³⁶³⁹ is an apocalyptic number.

173639 is a deficient number, since it is larger than the sum of its proper divisors (2041).

173639 is an equidigital number, since it uses as much as digits as its factorization.

173639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 3402, while the sum is 29.

The square root of 173639 is about 416.7001319894. The cubic root of 173639 is about 55.7890661722.

The spelling of 173639 in words is "one hundred seventy-three thousand, six hundred thirty-nine".