287899 has 4 divisors (see below), whose sum is σ = 292264. Its totient is φ = 283536.

The previous prime is 287887. The next prime is 287921. The reversal of 287899 is 998782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998782 = 2 ⋅499391.

It is a cyclic number.

It is not a de Polignac number, because 287899 - 2⁵ = 287867 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2082 + ... + 2215.

It is an arithmetic number, because the mean of its divisors is an integer number (73066).

2²⁸⁷⁸⁹⁹ is an apocalyptic number.

287899 is a deficient number, since it is larger than the sum of its proper divisors (4365).

287899 is an equidigital number, since it uses as much as digits as its factorization.

287899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4364.

The product of its digits is 72576, while the sum is 43.

The square root of 287899 is about 536.5622051543. The cubic root of 287899 is about 66.0308242917.

The spelling of 287899 in words is "two hundred eighty-seven thousand, eight hundred ninety-nine".