172989 has 16 divisors (see below), whose sum is σ = 264000. Its totient is φ = 111888.
The previous prime is 172987. The next prime is 172993. The reversal of 172989 is 989271.
It is a happy number.
It is not a de Polignac number, because 172989 - 21 = 172987 is a prime.
It is a Curzon number.
172989 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (172981) 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 15 ways as a sum of consecutive naturals, for example, 1087 + ... + 1235.
It is an arithmetic number, because the mean of its divisors is an integer number (16500).
2172989 is an apocalyptic number.
It is an amenable number.
172989 is a deficient number, since it is larger than the sum of its proper divisors (91011).
172989 is a wasteful number, since it uses less digits than its factorization.
172989 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 201 (or 195 counting only the distinct ones).
The product of its digits is 9072, while the sum is 36.
The square root of 172989 is about 415.9194633580. The cubic root of 172989 is about 55.7193655554.
The spelling of 172989 in words is "one hundred seventy-two thousand, nine hundred eighty-nine".
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