285172 has 6 divisors (see below), whose sum is σ = 499058. Its totient is φ = 142584.

The previous prime is 285161. The next prime is 285179. The reversal of 285172 is 271582.

It can be written as a sum of positive squares in only one way, i.e., 285156 + 16 = 534^2 + 4^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285179) by changing a digit.

285172 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35643 + ... + 35650.

2²⁸⁵¹⁷² is an apocalyptic number.

It is an amenable number.

285172 is a deficient number, since it is larger than the sum of its proper divisors (213886).

285172 is a wasteful number, since it uses less digits than its factorization.

285172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71297 (or 71295 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 285172 is about 534.0149810633. The cubic root of 285172 is about 65.8216796478.

The spelling of 285172 in words is "two hundred eighty-five thousand, one hundred seventy-two".