684398173 has 12 divisors (see below), whose sum is σ = 715829940. Its totient is φ = 653517312.

The previous prime is 684398167. The next prime is 684398177. The reversal of 684398173 is 371893486.

It is a happy number.

684398173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 6160324 + 678237849 = 2482^2 + 26043^2 .

It is not a de Polignac number, because 684398173 - 2²⁵ = 650843741 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 (684398177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1497361 + ... + 1497817.

It is an arithmetic number, because the mean of its divisors is an integer number (59652495).

Almost surely, 2^684398173 is an apocalyptic number.

It is an amenable number.

684398173 is a deficient number, since it is larger than the sum of its proper divisors (31431767).

684398173 is an equidigital number, since it uses as much as digits as its factorization.

684398173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 599 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 684398173 is about 26161.0048163292. The cubic root of 684398173 is about 881.2577456657.

The spelling of 684398173 in words is "six hundred eighty-four million, three hundred ninety-eight thousand, one hundred seventy-three".