684059 has 4 divisors (see below), whose sum is σ = 688800. Its totient is φ = 679320.

The previous prime is 684053. The next prime is 684091. The reversal of 684059 is 950486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 950486 = 2 ⋅475243.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2147 + ... + 2444.

It is an arithmetic number, because the mean of its divisors is an integer number (172200).

2⁶⁸⁴⁰⁵⁹ is an apocalyptic number.

684059 is a deficient number, since it is larger than the sum of its proper divisors (4741).

684059 is a wasteful number, since it uses less digits than its factorization.

684059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4740.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 684059 is about 827.0785936052. The cubic root of 684059 is about 88.1112144155. Note that the first 3 decimals are identical.

The spelling of 684059 in words is "six hundred eighty-four thousand, fifty-nine".