684395 has 4 divisors (see below), whose sum is σ = 821280. Its totient is φ = 547512.

The previous prime is 684379. The next prime is 684407. The reversal of 684395 is 593486.

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 684395 - 2⁴ = 684379 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68435 + ... + 68444.

It is an arithmetic number, because the mean of its divisors is an integer number (205320).

2⁶⁸⁴³⁹⁵ is an apocalyptic number.

684395 is a deficient number, since it is larger than the sum of its proper divisors (136885).

684395 is a wasteful number, since it uses less digits than its factorization.

684395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136884.

The product of its digits is 25920, while the sum is 35.

The square root of 684395 is about 827.2816932581. The cubic root of 684395 is about 88.1256383771.

Subtracting from 684395 its reverse (593486), we obtain a palindrome (90909).

The spelling of 684395 in words is "six hundred eighty-four thousand, three hundred ninety-five".