863986 has 4 divisors (see below), whose sum is σ = 1295982. Its totient is φ = 431992.

The previous prime is 863983. The next prime is 864007. The reversal of 863986 is 689368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 323761 = 735^2 + 569^2 .

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 as a sum of consecutive naturals, namely, 215995 + ... + 215998.

2⁸⁶³⁹⁸⁶ is an apocalyptic number.

863986 is a deficient number, since it is larger than the sum of its proper divisors (431996).

863986 is a wasteful number, since it uses less digits than its factorization.

863986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431995.

The product of its digits is 62208, while the sum is 40.

The square root of 863986 is about 929.5084722583. The cubic root of 863986 is about 95.2435486798.

It can be divided in two parts, 863 and 986, that added together give a square (1849 = 43²).

The spelling of 863986 in words is "eight hundred sixty-three thousand, nine hundred eighty-six".