684975 has 12 divisors (see below), whose sum is σ = 1132616. Its totient is φ = 365280.

The previous prime is 684973. The next prime is 684977. The reversal of 684975 is 579486.

It is an interprime number because it is at equal distance from previous prime (684973) and next prime (684977).

It is not a de Polignac number, because 684975 - 2¹ = 684973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 684975.

It is not an unprimeable number, because it can be changed into a prime (684973) 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 11 ways as a sum of consecutive naturals, for example, 4492 + ... + 4641.

2⁶⁸⁴⁹⁷⁵ is an apocalyptic number.

684975 is a deficient number, since it is larger than the sum of its proper divisors (447641).

684975 is a wasteful number, since it uses less digits than its factorization.

684975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9146 (or 9141 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 684975 is about 827.6321646722. The cubic root of 684975 is about 88.1505257780.

The spelling of 684975 in words is "six hundred eighty-four thousand, nine hundred seventy-five".