285409240 has 64 divisors (see below), whose sum is σ = 665314560. Its totient is φ = 110123520.

The previous prime is 285409217. The next prime is 285409253. The reversal of 285409240 is 42904582.

It is a junction number, because it is equal to n+sod(n) for n = 285409196 and 285409205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128217 + ... + 130423.

It is an arithmetic number, because the mean of its divisors is an integer number (10395540).

Almost surely, 2^285409240 is an apocalyptic number.

285409240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285409240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332657280).

285409240 is an abundant number, since it is smaller than the sum of its proper divisors (379905320).

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

285409240 is a wasteful number, since it uses less digits than its factorization.

285409240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2328 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 285409240 is about 16894.0593108939. The cubic root of 285409240 is about 658.3992735674.

The spelling of 285409240 in words is "two hundred eighty-five million, four hundred nine thousand, two hundred forty".