217485 has 24 divisors (see below), whose sum is σ = 393120. Its totient is φ = 115344.

The previous prime is 217463. The next prime is 217489. The reversal of 217485 is 584712.

217485 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217485 - 2⁶ = 217421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

217485 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1126 + ... + 1304.

It is an arithmetic number, because the mean of its divisors is an integer number (16380).

2²¹⁷⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

217485 is a deficient number, since it is larger than the sum of its proper divisors (175635).

217485 is an equidigital number, since it uses as much as digits as its factorization.

217485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 187 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 217485 is about 466.3528706891. The cubic root of 217485 is about 60.1371860939.

The spelling of 217485 in words is "two hundred seventeen thousand, four hundred eighty-five".