863684 has 6 divisors (see below), whose sum is σ = 1511454. Its totient is φ = 431840.

The previous prime is 863671. The next prime is 863689. The reversal of 863684 is 486368.

863684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 861184 + 2500 = 928^2 + 50^2 .

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (863689) by changing a digit.

863684 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107957 + ... + 107964.

It is an arithmetic number, because the mean of its divisors is an integer number (251909).

2⁸⁶³⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

863684 is a deficient number, since it is larger than the sum of its proper divisors (647770).

863684 is a wasteful number, since it uses less digits than its factorization.

863684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215925 (or 215923 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 863684 is about 929.3460066089. The cubic root of 863684 is about 95.2324501575.

The spelling of 863684 in words is "eight hundred sixty-three thousand, six hundred eighty-four".