684863 has 4 divisors (see below), whose sum is σ = 690000. Its totient is φ = 679728.

The previous prime is 684857. The next prime is 684869. The reversal of 684863 is 368486.

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

It is an interprime number because it is at equal distance from previous prime (684857) and next prime (684869).

It is a cyclic number.

It is not a de Polignac number, because 684863 - 2⁶ = 684799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684869) 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 3 ways as a sum of consecutive naturals, for example, 2363 + ... + 2636.

It is an arithmetic number, because the mean of its divisors is an integer number (172500).

2⁶⁸⁴⁸⁶³ is an apocalyptic number.

684863 is a deficient number, since it is larger than the sum of its proper divisors (5137).

684863 is a wasteful number, since it uses less digits than its factorization.

684863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5136.

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

The square root of 684863 is about 827.5644989969. The cubic root of 684863 is about 88.1457210299.

The spelling of 684863 in words is "six hundred eighty-four thousand, eight hundred sixty-three".