840708 has 54 divisors (see below), whose sum is σ = 2347982. Its totient is φ = 253440.

The previous prime is 840703. The next prime is 840709. The reversal of 840708 is 807048.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 213444 = 792^2 + 462^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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

840708 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4260 + ... + 4452.

2⁸⁴⁰⁷⁰⁸ 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 840708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173991).

840708 is an abundant number, since it is smaller than the sum of its proper divisors (1507274).

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

840708 is a wasteful number, since it uses less digits than its factorization.

840708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 840708 is about 916.9013033037. The cubic root of 840708 is about 94.3803811092.

The spelling of 840708 in words is "eight hundred forty thousand, seven hundred eight".