285397 has 4 divisors (see below), whose sum is σ = 326176. Its totient is φ = 244620.

The previous prime is 285377. The next prime is 285421. The reversal of 285397 is 793582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285397 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 (285317) 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, 20379 + ... + 20392.

It is an arithmetic number, because the mean of its divisors is an integer number (81544).

2²⁸⁵³⁹⁷ is an apocalyptic number.

It is an amenable number.

285397 is a deficient number, since it is larger than the sum of its proper divisors (40779).

285397 is an equidigital number, since it uses as much as digits as its factorization.

285397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40778.

The product of its digits is 15120, while the sum is 34.

The square root of 285397 is about 534.2256077726. The cubic root of 285397 is about 65.8389861442.

The spelling of 285397 in words is "two hundred eighty-five thousand, three hundred ninety-seven".