684723 has 16 divisors (see below), whose sum is σ = 998816. Its totient is φ = 414720.

The previous prime is 684713. The next prime is 684727. The reversal of 684723 is 327486.

It is not a de Polignac number, because 684723 - 2¹⁰ = 683699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684727) 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 15 ways as a sum of consecutive naturals, for example, 3693 + ... + 3873.

It is an arithmetic number, because the mean of its divisors is an integer number (62426).

2⁶⁸⁴⁷²³ is an apocalyptic number.

684723 is a deficient number, since it is larger than the sum of its proper divisors (314093).

684723 is a wasteful number, since it uses less digits than its factorization.

684723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294.

The product of its digits is 8064, while the sum is 30.

The square root of 684723 is about 827.4799091217. The cubic root of 684723 is about 88.1397143580.

The spelling of 684723 in words is "six hundred eighty-four thousand, seven hundred twenty-three".