285331389 has 8 divisors (see below), whose sum is σ = 434790720. Its totient is φ = 163046496.

The previous prime is 285331367. The next prime is 285331411. The reversal of 285331389 is 983133582.

It is an interprime number because it is at equal distance from previous prime (285331367) and next prime (285331411).

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

It is not a de Polignac number, because 285331389 - 2¹² = 285327293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285331389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285331339) 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, 6793584 + ... + 6793625.

It is an arithmetic number, because the mean of its divisors is an integer number (54348840).

Almost surely, 2^285331389 is an apocalyptic number.

It is an amenable number.

285331389 is a deficient number, since it is larger than the sum of its proper divisors (149459331).

285331389 is a wasteful number, since it uses less digits than its factorization.

285331389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13587219.

The product of its digits is 155520, while the sum is 42.

The square root of 285331389 is about 16891.7550597917. The cubic root of 285331389 is about 658.3394043272.

The spelling of 285331389 in words is "two hundred eighty-five million, three hundred thirty-one thousand, three hundred eighty-nine".