285987143 has 8 divisors (see below), whose sum is σ = 308388528. Its totient is φ = 263643264.

The previous prime is 285987131. The next prime is 285987167. The reversal of 285987143 is 341789582.

It is a happy number.

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 285987143 - 2⁴ = 285987127 is a prime.

It is a super-2 number, since 2×285987143² = 163577291922604898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285987043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3746 + ... + 24207.

It is an arithmetic number, because the mean of its divisors is an integer number (38548566).

Almost surely, 2^285987143 is an apocalyptic number.

285987143 is a deficient number, since it is larger than the sum of its proper divisors (22401385).

285987143 is a wasteful number, since it uses less digits than its factorization.

285987143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28753.

The product of its digits is 483840, while the sum is 47.

The square root of 285987143 is about 16911.1543958418. The cubic root of 285987143 is about 658.8433544891.

The spelling of 285987143 in words is "two hundred eighty-five million, nine hundred eighty-seven thousand, one hundred forty-three".