684598 has 4 divisors (see below), whose sum is σ = 1026900. Its totient is φ = 342298.

The previous prime is 684587. The next prime is 684599. The reversal of 684598 is 895486.

684598 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: 895486 = 2 ⋅447743.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 684598.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171148 + ... + 171151.

It is an arithmetic number, because the mean of its divisors is an integer number (256725).

2⁶⁸⁴⁵⁹⁸ is an apocalyptic number.

684598 is a deficient number, since it is larger than the sum of its proper divisors (342302).

684598 is a wasteful number, since it uses less digits than its factorization.

684598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342301.

The product of its digits is 69120, while the sum is 40.

The square root of 684598 is about 827.4043751395. The cubic root of 684598 is about 88.1343505663.

The spelling of 684598 in words is "six hundred eighty-four thousand, five hundred ninety-eight".