179989 has 2 divisors, whose sum is σ = 179990. Its totient is φ = 179988.

The previous prime is 179981. The next prime is 179999. The reversal of 179989 is 989971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152100 + 27889 = 390^2 + 167^2 .

It is an emirp because it is prime and its reverse (989971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 179989 - 2³ = 179981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (179981) 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 as a sum of consecutive naturals, namely, 89994 + 89995.

It is an arithmetic number, because the mean of its divisors is an integer number (89995).

2¹⁷⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

179989 is a deficient number, since it is larger than the sum of its proper divisors (1).

179989 is an equidigital number, since it uses as much as digits as its factorization.

179989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 43.

The square root of 179989 is about 424.2511048895. The cubic root of 179989 is about 56.4610115543.

The spelling of 179989 in words is "one hundred seventy-nine thousand, nine hundred eighty-nine".