863994 has 8 divisors (see below), whose sum is σ = 1728000. Its totient is φ = 287996.

The previous prime is 863983. The next prime is 864007. The reversal of 863994 is 499368.

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

863994 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71994 + ... + 72005.

It is an arithmetic number, because the mean of its divisors is an integer number (216000).

2⁸⁶³⁹⁹⁴ is an apocalyptic number.

863994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

863994 is a wasteful number, since it uses less digits than its factorization.

863994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144004.

The product of its digits is 46656, while the sum is 39.

The square root of 863994 is about 929.5127755981. The cubic root of 863994 is about 95.2438426452.

Subtracting from 863994 its sum of digits (39), we obtain a triangular number (863955 = T₁₃₁₄).

The spelling of 863994 in words is "eight hundred sixty-three thousand, nine hundred ninety-four".