840812 has 12 divisors (see below), whose sum is σ = 1681680. Its totient is φ = 360336.

The previous prime is 840767. The next prime is 840817. The reversal of 840812 is 218048.

840812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

840812 is an admirable number.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (840817) by changing a digit.

840812 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 3 ways as a sum of consecutive naturals, for example, 14987 + ... + 15042.

It is an arithmetic number, because the mean of its divisors is an integer number (140140).

2⁸⁴⁰⁸¹² is an apocalyptic number.

It is an amenable number.

840812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

840812 is a wasteful number, since it uses less digits than its factorization.

840812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30040 (or 30038 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 840812 is about 916.9580143060. The cubic root of 840812 is about 94.3842727319.

The spelling of 840812 in words is "eight hundred forty thousand, eight hundred twelve".