285389 has 8 divisors (see below), whose sum is σ = 318360. Its totient is φ = 254016.

The previous prime is 285377. The next prime is 285421. The reversal of 285389 is 983582.

285389 = 92² + 93² + ... + 117².

It can be written as a sum of positive squares in 4 ways, for example, as 20164 + 265225 = 142^2 + 515^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285389 is a prime.

It is a d-powerful number, because it can be written as 2¹⁰ + 8 + 3³ + 5⁶ + 8⁶ + 9⁴ .

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285289) 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, 2 + ... + 755.

It is an arithmetic number, because the mean of its divisors is an integer number (39795).

2²⁸⁵³⁸⁹ is an apocalyptic number.

285389 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

285389 is a deficient number, since it is larger than the sum of its proper divisors (32971).

285389 is a wasteful number, since it uses less digits than its factorization.

285389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799.

The product of its digits is 17280, while the sum is 35.

The square root of 285389 is about 534.2181202468. The cubic root of 285389 is about 65.8383709581.

The spelling of 285389 in words is "two hundred eighty-five thousand, three hundred eighty-nine".