840342 has 8 divisors (see below), whose sum is σ = 1680696. Its totient is φ = 280112.

The previous prime is 840341. The next prime is 840347. The reversal of 840342 is 243048.

It is a happy number.

840342 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

840342 is an admirable 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 840342.

It is not an unprimeable number, because it can be changed into a prime (840341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70023 + ... + 70034.

It is an arithmetic number, because the mean of its divisors is an integer number (210087).

2⁸⁴⁰³⁴² is an apocalyptic number.

840342 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.

840342 is a wasteful number, since it uses less digits than its factorization.

840342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140062.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 840342 is about 916.7016963004. The cubic root of 840342 is about 94.3666830383.

The spelling of 840342 in words is "eight hundred forty thousand, three hundred forty-two".