863998 has 8 divisors (see below), whose sum is σ = 1307808. Its totient is φ = 428064.

The previous prime is 863983. The next prime is 864007. The reversal of 863998 is 899368.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686 + ... + 2137.

It is an arithmetic number, because the mean of its divisors is an integer number (163476).

2⁸⁶³⁹⁹⁸ is an apocalyptic number.

863998 is a deficient number, since it is larger than the sum of its proper divisors (443810).

863998 is a wasteful number, since it uses less digits than its factorization.

863998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938.

The product of its digits is 93312, while the sum is 43.

The square root of 863998 is about 929.5149272605. The cubic root of 863998 is about 95.2439896272.

Subtracting from 863998 its sum of digits (43), we obtain a triangular number (863955 = T₁₃₁₄).

The spelling of 863998 in words is "eight hundred sixty-three thousand, nine hundred ninety-eight".