684694 has 4 divisors (see below), whose sum is σ = 1027044. Its totient is φ = 342346.

The previous prime is 684683. The next prime is 684713. The reversal of 684694 is 496486.

684694 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 496486 = 2 ⋅248243.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171172 + ... + 171175.

It is an arithmetic number, because the mean of its divisors is an integer number (256761).

2⁶⁸⁴⁶⁹⁴ is an apocalyptic number.

684694 is a deficient number, since it is larger than the sum of its proper divisors (342350).

684694 is a wasteful number, since it uses less digits than its factorization.

684694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342349.

The product of its digits is 41472, while the sum is 37.

The square root of 684694 is about 827.4623858521. The cubic root of 684694 is about 88.1384700165.

It can be divided in two parts, 684 and 694, that added together give a triangular number (1378 = T₅₂).

The spelling of 684694 in words is "six hundred eighty-four thousand, six hundred ninety-four".