684067 has 4 divisors (see below), whose sum is σ = 686880. Its totient is φ = 681256.

The previous prime is 684053. The next prime is 684091. The reversal of 684067 is 760486.

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

It is a cyclic number.

It is not a de Polignac number, because 684067 - 2⁷ = 683939 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684007) 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, 1003 + ... + 1540.

It is an arithmetic number, because the mean of its divisors is an integer number (171720).

2⁶⁸⁴⁰⁶⁷ is an apocalyptic number.

684067 is a deficient number, since it is larger than the sum of its proper divisors (2813).

684067 is a wasteful number, since it uses less digits than its factorization.

684067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 684067 is about 827.0834298908. The cubic root of 684067 is about 88.1115578981. Note that the first 3 decimals are identical.

The spelling of 684067 in words is "six hundred eighty-four thousand, sixty-seven".