840704 has 22 divisors (see below), whose sum is σ = 1682634. Its totient is φ = 419840.

The previous prime is 840703. The next prime is 840709. The reversal of 840704 is 407048.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 200704 = 800^2 + 448^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 840704.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840704.

It is not an unprimeable number, because it can be changed into a prime (840703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614 + ... + 1434.

2⁸⁴⁰⁷⁰⁴ 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 840704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841317).

840704 is an abundant number, since it is smaller than the sum of its proper divisors (841930).

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

840704 is an equidigital number, since it uses as much as digits as its factorization.

840704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 840704 is about 916.8991220412. The cubic root of 840704 is about 94.3802314250.

The spelling of 840704 in words is "eight hundred forty thousand, seven hundred four".