684894 has 32 divisors (see below), whose sum is σ = 1635840. Its totient is φ = 186912.

The previous prime is 684889. The next prime is 684923. The reversal of 684894 is 498486.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

684894 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (51120).

2⁶⁸⁴⁸⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817920).

684894 is an abundant number, since it is smaller than the sum of its proper divisors (950946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684894 is a wasteful number, since it uses less digits than its factorization.

684894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its digits is 55296, while the sum is 39.

The square root of 684894 is about 827.5832284429. The cubic root of 684894 is about 88.1470509680.

The spelling of 684894 in words is "six hundred eighty-four thousand, eight hundred ninety-four".