684959 has 8 divisors (see below), whose sum is σ = 758352. Its totient is φ = 613440.

The previous prime is 684949. The next prime is 684961. The reversal of 684959 is 959486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377 + ... + 1229.

It is an arithmetic number, because the mean of its divisors is an integer number (94794).

2⁶⁸⁴⁹⁵⁹ is an apocalyptic number.

684959 is a deficient number, since it is larger than the sum of its proper divisors (73393).

684959 is a wasteful number, since it uses less digits than its factorization.

684959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937.

The product of its digits is 77760, while the sum is 41.

The square root of 684959 is about 827.6224984859. The cubic root of 684959 is about 88.1498394175.

The spelling of 684959 in words is "six hundred eighty-four thousand, nine hundred fifty-nine".