840918 has 16 divisors (see below), whose sum is σ = 1811376. Its totient is φ = 258720.

The previous prime is 840911. The next prime is 840923. The reversal of 840918 is 819048.

It is a happy number.

It is a Curzon number.

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 840918.

It is not an unprimeable number, because it can be changed into a prime (840911) by changing a digit.

840918 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5313 + ... + 5468.

It is an arithmetic number, because the mean of its divisors is an integer number (113211).

2⁸⁴⁰⁹¹⁸ is an apocalyptic number.

840918 is an abundant number, since it is smaller than the sum of its proper divisors (970458).

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

840918 is a wasteful number, since it uses less digits than its factorization.

840918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10799.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 840918 is about 917.0158122955. The cubic root of 840918 is about 94.3882388632.

The spelling of 840918 in words is "eight hundred forty thousand, nine hundred eighteen".