172985 has 8 divisors (see below), whose sum is σ = 214920. Its totient is φ = 133504.

The previous prime is 172981. The next prime is 172987. The reversal of 172985 is 589271.

It can be written as a sum of positive squares in 4 ways, for example, as 19321 + 153664 = 139^2 + 392^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172985 - 2² = 172981 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452 + ... + 741.

It is an arithmetic number, because the mean of its divisors is an integer number (26865).

2¹⁷²⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

172985 is a deficient number, since it is larger than the sum of its proper divisors (41935).

172985 is a wasteful number, since it uses less digits than its factorization.

172985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227.

The product of its digits is 5040, while the sum is 32.

The square root of 172985 is about 415.9146547069. The cubic root of 172985 is about 55.7189360885.

The spelling of 172985 in words is "one hundred seventy-two thousand, nine hundred eighty-five".