287842 has 8 divisors (see below), whose sum is σ = 441936. Its totient is φ = 140532.

The previous prime is 287821. The next prime is 287849. The reversal of 287842 is 248782.

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

It is not an unprimeable number, because it can be changed into a prime (287849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1588 + ... + 1759.

It is an arithmetic number, because the mean of its divisors is an integer number (55242).

2²⁸⁷⁸⁴² is an apocalyptic number.

287842 is a deficient number, since it is larger than the sum of its proper divisors (154094).

287842 is a wasteful number, since it uses less digits than its factorization.

287842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392.

The product of its digits is 7168, while the sum is 31.

The square root of 287842 is about 536.5090865959. The cubic root of 287842 is about 66.0264662756.

Subtracting from 287842 its reverse (248782), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 287842 in words is "two hundred eighty-seven thousand, eight hundred forty-two".