179987 has 4 divisors (see below), whose sum is σ = 189480. Its totient is φ = 170496.

The previous prime is 179981. The next prime is 179989. The reversal of 179987 is 789971.

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

It is a cyclic number.

It is not a de Polignac number, because 179987 - 2⁶ = 179923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a 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 in 3 ways as a sum of consecutive naturals, for example, 4718 + ... + 4755.

It is an arithmetic number, because the mean of its divisors is an integer number (47370).

2¹⁷⁹⁹⁸⁷ is an apocalyptic number.

179987 is a deficient number, since it is larger than the sum of its proper divisors (9493).

179987 is an equidigital number, since it uses as much as digits as its factorization.

179987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492.

The product of its digits is 31752, while the sum is 41.

The square root of 179987 is about 424.2487477884. The cubic root of 179987 is about 56.4608024259.

The spelling of 179987 in words is "one hundred seventy-nine thousand, nine hundred eighty-seven".