684774 has 24 divisors (see below), whose sum is σ = 1539720. Its totient is φ = 228096.

The previous prime is 684773. The next prime is 684791. The reversal of 684774 is 477486.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (64155).

2⁶⁸⁴⁷⁷⁴ is an apocalyptic number.

684774 is an abundant number, since it is smaller than the sum of its proper divisors (854946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684774 is a wasteful number, since it uses less digits than its factorization.

684774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426 (or 1414 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 684774 is about 827.5107250060. The cubic root of 684774 is about 88.1419025976.

The spelling of 684774 in words is "six hundred eighty-four thousand, seven hundred seventy-four".