684986 has 8 divisors (see below), whose sum is σ = 1072224. Its totient is φ = 327580.

The previous prime is 684977. The next prime is 684989. The reversal of 684986 is 689486.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 684986.

It is not an unprimeable number, because it can be changed into a prime (684989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7400 + ... + 7491.

It is an arithmetic number, because the mean of its divisors is an integer number (134028).

2⁶⁸⁴⁹⁸⁶ is an apocalyptic number.

684986 is a deficient number, since it is larger than the sum of its proper divisors (387238).

684986 is a wasteful number, since it uses less digits than its factorization.

684986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14916.

The product of its digits is 82944, while the sum is 41.

The square root of 684986 is about 827.6388101098. The cubic root of 684986 is about 88.1509976447.

The spelling of 684986 in words is "six hundred eighty-four thousand, nine hundred eighty-six".