173989 has 4 divisors (see below), whose sum is σ = 174924. Its totient is φ = 173056.

The previous prime is 173981. The next prime is 173993. The reversal of 173989 is 989371.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 1764 = 415^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 173989 - 2³ = 173981 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 (173981) 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, 82 + ... + 595.

It is an arithmetic number, because the mean of its divisors is an integer number (43731).

2¹⁷³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

173989 is a deficient number, since it is larger than the sum of its proper divisors (935).

173989 is an equidigital number, since it uses as much as digits as its factorization.

173989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934.

The product of its digits is 13608, while the sum is 37.

The square root of 173989 is about 417.1198868431. The cubic root of 173989 is about 55.8265252460.

The spelling of 173989 in words is "one hundred seventy-three thousand, nine hundred eighty-nine".