684947 has 8 divisors (see below), whose sum is σ = 742896. Its totient is φ = 628992.

The previous prime is 684923. The next prime is 684949. The reversal of 684947 is 749486.

It is a happy number.

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 684947 - 2¹⁰ = 683923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684947.

It is not an unprimeable number, because it can be changed into a prime (684949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (92862).

2⁶⁸⁴⁹⁴⁷ is an apocalyptic number.

684947 is a deficient number, since it is larger than the sum of its proper divisors (57949).

684947 is a wasteful number, since it uses less digits than its factorization.

684947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997.

The product of its digits is 48384, while the sum is 38.

The square root of 684947 is about 827.6152487720. The cubic root of 684947 is about 88.1493246401.

The spelling of 684947 in words is "six hundred eighty-four thousand, nine hundred forty-seven".