855987 has 8 divisors (see below), whose sum is σ = 1245120. Its totient is φ = 518760.

The previous prime is 855983. The next prime is 855989. The reversal of 855987 is 789558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855987 - 2² = 855983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12937 + ... + 13002.

It is an arithmetic number, because the mean of its divisors is an integer number (155640).

2⁸⁵⁵⁹⁸⁷ is an apocalyptic number.

855987 is a deficient number, since it is larger than the sum of its proper divisors (389133).

855987 is a wasteful number, since it uses less digits than its factorization.

855987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25953.

The product of its digits is 100800, while the sum is 42.

The square root of 855987 is about 925.1956549833. The cubic root of 855987 is about 94.9487073063.

It can be divided in two parts, 8559 and 87, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 855987 in words is "eight hundred fifty-five thousand, nine hundred eighty-seven".