863987 has 8 divisors (see below), whose sum is σ = 934800. Its totient is φ = 795744.

The previous prime is 863983. The next prime is 864007. The reversal of 863987 is 789368.

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

It is a cyclic number.

It is not a de Polignac number, because 863987 - 2² = 863983 is a prime.

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

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 7 ways as a sum of consecutive naturals, for example, 89 + ... + 1317.

It is an arithmetic number, because the mean of its divisors is an integer number (116850).

2⁸⁶³⁹⁸⁷ is an apocalyptic number.

863987 is a deficient number, since it is larger than the sum of its proper divisors (70813).

863987 is a wasteful number, since it uses less digits than its factorization.

863987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285.

The product of its digits is 72576, while the sum is 41.

The square root of 863987 is about 929.5090101769. The cubic root of 863987 is about 95.2435854256.

The spelling of 863987 in words is "eight hundred sixty-three thousand, nine hundred eighty-seven".