684898 has 4 divisors (see below), whose sum is σ = 1027350. Its totient is φ = 342448.

The previous prime is 684889. The next prime is 684923. The reversal of 684898 is 898486.

684898 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: 898486 = 2 ⋅449243.

It can be written as a sum of positive squares in only one way, i.e., 677329 + 7569 = 823^2 + 87^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171223 + ... + 171226.

2⁶⁸⁴⁸⁹⁸ is an apocalyptic number.

684898 is a deficient number, since it is larger than the sum of its proper divisors (342452).

684898 is a wasteful number, since it uses less digits than its factorization.

684898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342451.

The product of its digits is 110592, while the sum is 43.

The square root of 684898 is about 827.5856451148. The cubic root of 684898 is about 88.1472225699.

The spelling of 684898 in words is "six hundred eighty-four thousand, eight hundred ninety-eight".