684387 has 24 divisors (see below), whose sum is σ = 1118208. Its totient is φ = 399600.

The previous prime is 684379. The next prime is 684407. The reversal of 684387 is 783486.

684387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 684387 - 2³ = 684379 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2958 + ... + 3180.

It is an arithmetic number, because the mean of its divisors is an integer number (46592).

2⁶⁸⁴³⁸⁷ is an apocalyptic number.

684387 is a deficient number, since it is larger than the sum of its proper divisors (433821).

684387 is a wasteful number, since it uses less digits than its factorization.

684387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 268 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 684387 is about 827.2768581315. The cubic root of 684387 is about 88.1252950043.

Subtracting 684387 from its reverse (783486), we obtain a palindrome (99099).

The spelling of 684387 in words is "six hundred eighty-four thousand, three hundred eighty-seven".