285400 has 24 divisors (see below), whose sum is σ = 664020. Its totient is φ = 114080.

The previous prime is 285377. The next prime is 285421. The reversal of 285400 is 4582.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 514 + ... + 913.

2²⁸⁵⁴⁰⁰ is an apocalyptic number.

285400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285400 is an abundant number, since it is smaller than the sum of its proper divisors (378620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285400 is a wasteful number, since it uses less digits than its factorization.

285400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 285400 is about 534.2284155677. The cubic root of 285400 is about 65.8392168361.

Adding to 285400 its reverse (4582), we get a palindrome (289982).

The spelling of 285400 in words is "two hundred eighty-five thousand, four hundred".