684399 has 8 divisors (see below), whose sum is σ = 960640. Its totient is φ = 432216.

The previous prime is 684379. The next prime is 684407. The reversal of 684399 is 993486.

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

It is not a de Polignac number, because 684399 - 2⁹ = 683887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5947 + ... + 6060.

It is an arithmetic number, because the mean of its divisors is an integer number (120080).

2⁶⁸⁴³⁹⁹ is an apocalyptic number.

684399 is a deficient number, since it is larger than the sum of its proper divisors (276241).

684399 is a wasteful number, since it uses less digits than its factorization.

684399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12029.

The product of its digits is 46656, while the sum is 39.

The square root of 684399 is about 827.2841108108. The cubic root of 684399 is about 88.1258100625.

The spelling of 684399 in words is "six hundred eighty-four thousand, three hundred ninety-nine".