863985 has 16 divisors (see below), whose sum is σ = 1393920. Its totient is φ = 456960.

The previous prime is 863983. The next prime is 864007. The reversal of 863985 is 589368.

It is not a de Polignac number, because 863985 - 2¹ = 863983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3465 + ... + 3705.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2⁸⁶³⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

863985 is a deficient number, since it is larger than the sum of its proper divisors (529935).

863985 is a wasteful number, since it uses less digits than its factorization.

863985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488.

The product of its digits is 51840, while the sum is 39.

The square root of 863985 is about 929.5079343395. The cubic root of 863985 is about 95.2435119340.

The spelling of 863985 in words is "eight hundred sixty-three thousand, nine hundred eighty-five".