285891389 has 8 divisors (see below), whose sum is σ = 327092160. Its totient is φ = 244780416.

The previous prime is 285891371. The next prime is 285891421. The reversal of 285891389 is 983198582.

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

It is a cyclic number.

It is not a de Polignac number, because 285891389 - 2¹² = 285887293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285891389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285891349) 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, 15479 + ... + 28484.

It is an arithmetic number, because the mean of its divisors is an integer number (40886520).

Almost surely, 2^285891389 is an apocalyptic number.

It is an amenable number.

285891389 is a deficient number, since it is larger than the sum of its proper divisors (41200771).

285891389 is an equidigital number, since it uses as much as digits as its factorization.

285891389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44899.

The product of its digits is 1244160, while the sum is 53.

The square root of 285891389 is about 16908.3230688321. The cubic root of 285891389 is about 658.7698151356.

The spelling of 285891389 in words is "two hundred eighty-five million, eight hundred ninety-one thousand, three hundred eighty-nine".