287999 has 4 divisors (see below), whose sum is σ = 297960. Its totient is φ = 278040.

The previous prime is 287977. The next prime is 288007. The reversal of 287999 is 999782.

287999 is nontrivially palindromic in base 13.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287999 is a prime.

It is a Duffinian number.

287999 is a modest number, since divided by 999 gives 287 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287939) 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, 4937 + ... + 4994.

It is an arithmetic number, because the mean of its divisors is an integer number (74490).

2²⁸⁷⁹⁹⁹ is an apocalyptic number.

287999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

287999 is a deficient number, since it is larger than the sum of its proper divisors (9961).

287999 is an equidigital number, since it uses as much as digits as its factorization.

287999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9960.

The product of its digits is 81648, while the sum is 44.

The square root of 287999 is about 536.6553829042. The cubic root of 287999 is about 66.0384685443.

The spelling of 287999 in words is "two hundred eighty-seven thousand, nine hundred ninety-nine".