285493 has 4 divisors (see below), whose sum is σ = 307468. Its totient is φ = 263520.

The previous prime is 285473. The next prime is 285497. The reversal of 285493 is 394582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 131044 + 154449 = 362^2 + 393^2 .

It is a cyclic number.

It is not a de Polignac number, because 285493 - 2¹³ = 277301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10968 + ... + 10993.

It is an arithmetic number, because the mean of its divisors is an integer number (76867).

2²⁸⁵⁴⁹³ is an apocalyptic number.

It is an amenable number.

285493 is a deficient number, since it is larger than the sum of its proper divisors (21975).

285493 is a wasteful number, since it uses less digits than its factorization.

285493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21974.

The product of its digits is 8640, while the sum is 31.

The square root of 285493 is about 534.3154498983. The cubic root of 285493 is about 65.8463674810.

The spelling of 285493 in words is "two hundred eighty-five thousand, four hundred ninety-three".