859987 has 2 divisors, whose sum is σ = 859988. Its totient is φ = 859986.

The previous prime is 859981. The next prime is 860009. The reversal of 859987 is 789958.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-859987 is a prime.

It is not a weakly prime, because it can be changed into another prime (859981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429993 + 429994.

It is an arithmetic number, because the mean of its divisors is an integer number (429994).

2⁸⁵⁹⁹⁸⁷ is an apocalyptic number.

859987 is a deficient number, since it is larger than the sum of its proper divisors (1).

859987 is an equidigital number, since it uses as much as digits as its factorization.

859987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The square root of 859987 is about 927.3548403928. The cubic root of 859987 is about 95.0963749580.

It can be divided in two parts, 8 and 59987, that added together give a palindrome (59995).

The spelling of 859987 in words is "eight hundred fifty-nine thousand, nine hundred eighty-seven".