285884221 has 16 divisors (see below), whose sum is σ = 334987776. Its totient is φ = 238887936.

The previous prime is 285884191. The next prime is 285884293. The reversal of 285884221 is 122488582.

It is not a de Polignac number, because 285884221 - 2¹⁹ = 285359933 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 (285881221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89565 + ... + 92701.

It is an arithmetic number, because the mean of its divisors is an integer number (20936736).

Almost surely, 2^285884221 is an apocalyptic number.

It is an amenable number.

285884221 is a deficient number, since it is larger than the sum of its proper divisors (49103555).

285884221 is a wasteful number, since it uses less digits than its factorization.

285884221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468.

The product of its digits is 81920, while the sum is 40.

The square root of 285884221 is about 16908.1111008888. Note that the first 4 decimals coincide. The cubic root of 285884221 is about 658.7643094300.

The spelling of 285884221 in words is "two hundred eighty-five million, eight hundred eighty-four thousand, two hundred twenty-one".