287939 has 2 divisors, whose sum is σ = 287940. Its totient is φ = 287938.

The previous prime is 287933. The next prime is 287977. The reversal of 287939 is 939782.

It is an a-pointer prime, because the next prime (287977) can be obtained adding 287939 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 287939 - 2¹⁶ = 222403 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287939.

It is not a weakly prime, because it can be changed into another prime (287933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143969 + 143970.

It is an arithmetic number, because the mean of its divisors is an integer number (143970).

2²⁸⁷⁹³⁹ is an apocalyptic number.

287939 is a deficient number, since it is larger than the sum of its proper divisors (1).

287939 is an equidigital number, since it uses as much as digits as its factorization.

287939 is an evil number, because the sum of its binary digits is even.

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

The square root of 287939 is about 536.5994781958. The cubic root of 287939 is about 66.0338822051.

The spelling of 287939 in words is "two hundred eighty-seven thousand, nine hundred thirty-nine".