840434 has 16 divisors (see below), whose sum is σ = 1453248. Its totient is φ = 357072.

The previous prime is 840353. The next prime is 840439. The reversal of 840434 is 434048.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840434.

It is not an unprimeable number, because it can be changed into a prime (840439) by changing a digit.

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, 2249 + ... + 2595.

It is an arithmetic number, because the mean of its divisors is an integer number (90828).

2⁸⁴⁰⁴³⁴ is an apocalyptic number.

840434 is a deficient number, since it is larger than the sum of its proper divisors (612814).

840434 is a wasteful number, since it uses less digits than its factorization.

840434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 840434 is about 916.7518748276. The cubic root of 840434 is about 94.3701266434.

The spelling of 840434 in words is "eight hundred forty thousand, four hundred thirty-four".