840934 has 4 divisors (see below), whose sum is σ = 1261404. Its totient is φ = 420466.

The previous prime is 840929. The next prime is 840941. The reversal of 840934 is 439048.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

840934 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 as a sum of consecutive naturals, namely, 210232 + ... + 210235.

It is an arithmetic number, because the mean of its divisors is an integer number (315351).

2⁸⁴⁰⁹³⁴ is an apocalyptic number.

840934 is a deficient number, since it is larger than the sum of its proper divisors (420470).

840934 is a wasteful number, since it uses less digits than its factorization.

840934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420469.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 840934 is about 917.0245362039. The cubic root of 840934 is about 94.3888374956.

The spelling of 840934 in words is "eight hundred forty thousand, nine hundred thirty-four".