319987 has 4 divisors (see below), whose sum is σ = 321160. Its totient is φ = 318816.

The previous prime is 319981. The next prime is 319993. The reversal of 319987 is 789913.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (319981) and next prime (319993).

It is a cyclic number.

It is not a de Polignac number, because 319987 - 2¹⁵ = 287219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (319981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64 + ... + 802.

It is an arithmetic number, because the mean of its divisors is an integer number (80290).

2³¹⁹⁹⁸⁷ is an apocalyptic number.

319987 is a deficient number, since it is larger than the sum of its proper divisors (1173).

319987 is an equidigital number, since it uses as much as digits as its factorization.

319987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172.

The product of its digits is 13608, while the sum is 37.

The square root of 319987 is about 565.6739343473. The cubic root of 319987 is about 68.3981116176.

The spelling of 319987 in words is "three hundred nineteen thousand, nine hundred eighty-seven".