840534 has 16 divisors (see below), whose sum is σ = 1735680. Its totient is φ = 271080.

The previous prime is 840523. The next prime is 840547. The reversal of 840534 is 435048.

It is a happy 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 840534.

It is an unprimeable 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, 2074 + ... + 2445.

It is an arithmetic number, because the mean of its divisors is an integer number (108480).

2⁸⁴⁰⁵³⁴ is an apocalyptic number.

840534 is an abundant number, since it is smaller than the sum of its proper divisors (895146).

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

840534 is a wasteful number, since it uses less digits than its factorization.

840534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 840534 is about 916.8064135901. The cubic root of 840534 is about 94.3738694074.

The spelling of 840534 in words is "eight hundred forty thousand, five hundred thirty-four".