691804 has 12 divisors (see below), whose sum is σ = 1223824. Its totient is φ = 342144.

The previous prime is 691799. The next prime is 691813. The reversal of 691804 is 408196.

691804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504 + ... + 1279.

2⁶⁹¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

691804 is a deficient number, since it is larger than the sum of its proper divisors (532020).

691804 is a wasteful number, since it uses less digits than its factorization.

691804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884 (or 1882 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 691804 is about 831.7475578563. The cubic root of 691804 is about 88.4425025784.

The spelling of 691804 in words is "six hundred ninety-one thousand, eight hundred four".