684197 has 4 divisors (see below), whose sum is σ = 707820. Its totient is φ = 660576.

The previous prime is 684191. The next prime is 684217. The reversal of 684197 is 791486.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185761 + 498436 = 431^2 + 706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684197 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 (684191) 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, 11768 + ... + 11825.

It is an arithmetic number, because the mean of its divisors is an integer number (176955).

2⁶⁸⁴¹⁹⁷ is an apocalyptic number.

It is an amenable number.

684197 is a deficient number, since it is larger than the sum of its proper divisors (23623).

684197 is a wasteful number, since it uses less digits than its factorization.

684197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23622.

The product of its digits is 12096, while the sum is 35.

The square root of 684197 is about 827.1620155689. The cubic root of 684197 is about 88.1171391141.

The spelling of 684197 in words is "six hundred eighty-four thousand, one hundred ninety-seven".