287399 has 4 divisors (see below), whose sum is σ = 328464. Its totient is φ = 246336.

The previous prime is 287393. The next prime is 287437. The reversal of 287399 is 993782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993782 = 2 ⋅496891.

It is a cyclic number.

It is not a de Polignac number, because 287399 - 2⁴ = 287383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287399.

It is not an unprimeable number, because it can be changed into a prime (287393) 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, 20522 + ... + 20535.

It is an arithmetic number, because the mean of its divisors is an integer number (82116).

2²⁸⁷³⁹⁹ is an apocalyptic number.

287399 is a deficient number, since it is larger than the sum of its proper divisors (41065).

287399 is an equidigital number, since it uses as much as digits as its factorization.

287399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41064.

The product of its digits is 27216, while the sum is 38.

The square root of 287399 is about 536.0960734794. The cubic root of 287399 is about 65.9925764531.

It can be divided in two parts, 287 and 399, that added together give a palindrome (686).

The spelling of 287399 in words is "two hundred eighty-seven thousand, three hundred ninety-nine".