391704 has 32 divisors (see below), whose sum is σ = 1032000. Its totient is φ = 123552.

The previous prime is 391693. The next prime is 391711. The reversal of 391704 is 407193.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

391704 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27 + ... + 885.

It is an arithmetic number, because the mean of its divisors is an integer number (32250).

2³⁹¹⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (516000).

391704 is an abundant number, since it is smaller than the sum of its proper divisors (640296).

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

391704 is a wasteful number, since it uses less digits than its factorization.

391704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 391704 is about 625.8626047305. The cubic root of 391704 is about 73.1676885672.

Adding to 391704 its reverse (407193), we get a palindrome (798897).

The spelling of 391704 in words is "three hundred ninety-one thousand, seven hundred four".